Cisco 100-101 Practice Test Questions, Cisco 100-101 Exam Dumps

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The 100-101 Exam in Retrospect: Foundations of Modern Networking

The Cisco 100-101 exam, also known as ICND1, was one of the most popular entry-level IT certifications for many years. It served as the first major step for aspiring network engineers into the world of Cisco technologies. Passing the 100-101 exam granted the Cisco Certified Entry Networking Technician (CCENT) credential. This certification validated an individual's ability to install, operate, and troubleshoot a small enterprise branch network. It confirmed that the holder had the fundamental knowledge required to manage a network, from the physical cabling to basic IP addressing and routing.

For many, the CCENT was a stepping stone. It was the first of a two-exam path to earn the highly sought-after Cisco Certified Network Associate (CCNA) Routing and Switching certification. The 100-101 exam focused on the absolute fundamentals: network models, IP addressing, basic switch security, and an introduction to routing. While the exam number is now history, the concepts it tested are as critical today as they were then, forming the foundation of all modern networking.

The OSI and TCP/IP Models: A Networking Blueprint

The absolute starting point for any network professional, and a core topic of the 100-101 exam, is the understanding of network models. These models provide a conceptual framework that standardizes how different network protocols and devices communicate. The two essential models are the Open Systems Interconnection (OSI) model and the TCP/IP model. The OSI model is a 7-layer model that is excellent for teaching and for troubleshooting because it breaks down the complex process of network communication into distinct, manageable layers.

The TCP/IP model is a 4-layer model that is a more practical representation of how modern networks, including the internet, actually function. For the 100-101 exam, a candidate needed to know the layers of both models and the primary function of each layer. This knowledge is crucial because it provides a systematic way to think about network problems. When troubleshooting an issue, a skilled engineer will often work their way up or down the OSI model to isolate the problem.

Layer 1: The Physical Layer

Layer 1 of the OSI model is the Physical Layer. This is the layer where data is converted into bits and is physically transmitted over the network media. The 100-101 exam required an understanding of the components and concepts that operate at this foundational layer. This includes the different types of network cabling, such as unshielded twisted-pair (UTP) copper cables and fiber optic cables. A candidate needed to know the differences between them, their distance limitations, and their use cases.

This layer also includes the devices that operate at a purely physical level, such as hubs and repeaters. While hubs are now obsolete, understanding their function as a simple multi-port repeater was important for historical context. The Physical Layer is all about the electrical signals, the light pulses, the connectors, and the physical media that connect everything together. A problem at Layer 1, like a bad cable or a disconnected wire, will prevent any of the higher layers from functioning.

Layer 2: The Data Link Layer and Ethernet Switching

Layer 2 is the Data Link Layer. Its primary responsibility is to provide reliable, node-to-node data transfer. For the 100-101 exam, the focus of this layer was almost entirely on the Ethernet protocol. The Data Link Layer is where the concept of a physical or MAC address is introduced. Every network interface card (NIC) has a unique MAC address burned into it by the manufacturer. This layer is responsible for framing the data from the upper layers and adding the source and destination MAC addresses to create an Ethernet frame.

The primary device that operates at Layer 2 is the switch. A switch is an intelligent device that learns the MAC addresses of all the devices connected to its ports. It uses this information to make intelligent forwarding decisions, sending a frame only to the specific port where the destination device is located. This is a massive improvement over an old hub, which would blindly forward the frame to all ports. The 100-101 exam required a deep understanding of these fundamental switching concepts.

Layer 3: The Network Layer and IP Addressing

Layer 3 is the Network Layer, and its primary function is to provide logical addressing and to determine the best path for data to travel across a large network or an internetwork. This is the layer of the router. The protocol that dominates Layer 3 is the Internet Protocol, or IP. The 100-101 exam dedicated a huge portion of its objectives to IP addressing. An IP address is a logical address that is assigned to a device on a network.

Unlike a physical MAC address, an IP address is hierarchical and can be changed. It consists of a network portion and a host portion. Routers use the network portion of the destination IP address to make decisions about where to forward a packet to get it closer to its final destination. This process of moving packets from one network to another is called routing, and it is the fundamental technology that makes the internet possible.

Layer 4: The Transport Layer, TCP, and UDP

Layer 4 is the Transport Layer. Its primary role is to provide a mechanism for communication between two applications on different hosts. The two most important protocols at this layer, and a key topic for the 100-101 exam, are the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP). TCP is a connection-oriented protocol. It is known for being reliable because it provides features like error checking, sequencing, and flow control. It establishes a connection, ensures all data arrives in the correct order, and retransmits any lost segments.

UDP, on the other hand, is a connectionless protocol. It is known for being fast and low-overhead. It simply sends the data without establishing a connection or guaranteeing delivery. TCP is used for applications that require reliability, like web browsing or email. UDP is used for applications that are sensitive to delay and can tolerate some data loss, like live video streaming or online gaming. The 100-101 exam required a candidate to know the difference between these two protocols and their use cases.

From the 100-101 Exam to the Modern CCNA

In February 2020, Cisco completely revamped its certification program. The CCENT certification and the 100-101 exam were retired. The various specialized CCNA tracks (like Routing and Switching, Security, and Wireless) were consolidated into a single, comprehensive CCNA certification. This new CCNA is earned by passing one exam, the 200-301. While the structure has changed, the core knowledge has not disappeared.

The foundational topics that made up the entirety of the 100-101 exam—the OSI model, TCP/IP, subnetting, and basic switch and router configuration—are still a massive and essential part of the modern CCNA curriculum. They are the non-negotiable fundamentals that every network engineer must master. The new CCNA then builds upon this foundation by adding new topics that are critical for the modern network engineer, such as automation and security, reflecting the evolution of the industry.

The Importance of IPV4 Addressing

The ability to work with IPv4 addresses and to perform subnetting is arguably the single most important and challenging technical skill for any entry-level network certification, and it was a massive part of the 100-101 exam. An IP address is the logical address that uniquely identifies a device on a network. A deep understanding of how these addresses are structured and how they are used by routers to make forwarding decisions is absolutely essential for building and troubleshooting any network.

The 100-101 exam did not just require a theoretical understanding. It demanded that a candidate be able to perform the mathematical calculations of subnetting quickly and accurately, often without the aid of a calculator. This skill is critical because it allows a network administrator to take a large block of IP addresses and divide it into smaller, more manageable networks. This is essential for network segmentation, security, and the efficient use of a limited address space.

Understanding Binary and Dotted-Decimal Notation

To truly master IP addressing, you must first be comfortable with the binary number system. This was a prerequisite skill for tackling the subnetting questions on the 100-101 exam. An IPv4 address is a 32-bit number. Computers see this as a string of 32 ones and zeros. For humans, this is very difficult to read. Therefore, we represent the 32-bit address as four 8-bit numbers, called octets, and we convert each octet into its decimal equivalent. This is known as dotted-decimal notation (e.g., 192.168.1.1).

A key skill for the 100-101 exam was the ability to quickly convert a number between its decimal and 8-bit binary representation. For example, you needed to know that the decimal number 192 is represented in binary as 11000000. This is because all the subnetting calculations are performed on the binary representation of the address and the subnet mask. Without a solid grasp of binary math, it is impossible to perform these calculations correctly.

IP Address Classes and Private vs. Public Addresses

The 100-101 exam required a knowledge of the original classful IP addressing scheme. In this scheme, IPv4 addresses were divided into three main classes for unicast communication: Class A, Class B, and Class C. The class of an address was determined by the value of its first octet. A Class A address was intended for very large networks, a Class B for medium-sized networks, and a Class C for small networks. While this classful system is now mostly obsolete, understanding it provides important historical context.

More importantly, the exam required a deep understanding of the difference between public and private IP addresses. Certain ranges of addresses in each class were designated as private addresses. These addresses are not routable on the public internet and can be used freely by any organization on their internal network. The 100-101 exam expected you to have these private address ranges memorized, as they are a fundamental part of network design and the implementation of Network Address Translation (NAT).

The Concept of Subnetting: Borrowing Bits

Subnetting is the process of taking a single, large network and dividing it into multiple, smaller subnetworks, or subnets. This was the most difficult and most critical calculation-based skill on the 100-101 exam. Subnetting is done by "borrowing" bits from the host portion of an IP address and using them to create a new subnet portion. This is controlled by the subnet mask. The subnet mask is a 32-bit number that tells a device which part of its IP address is the network portion and which part is the host portion.

For example, if you have a Class C network, by default you have 24 bits for the network and 8 bits for the hosts. By changing the subnet mask, you could "borrow" 3 bits from the host portion. This would give you 27 bits for the network/subnet portion and leave you with 5 bits for the hosts. This would allow you to create 8 smaller subnets, with each subnet having up to 30 usable host addresses. The 100-101 exam required mastery of this process.

Calculating Network Addresses, Broadcast Addresses, and Host Ranges

Once you have subnetted a network, the 100-101 exam required you to be able to determine several key pieces of information for any given IP address. For any host IP address and its subnet mask, you needed to be able to calculate the network address of the subnet it belongs to. This is the first address in the range and is used to identify the subnet itself. You also needed to be able to calculate the broadcast address for that subnet. This is the last address in the range and is used to send a message to all hosts on that subnet.

The addresses in between the network address and the broadcast address are the usable host addresses that can be assigned to devices. A common question on the 100-101 exam would be to give you an IP address and a subnet mask and ask you to determine its network address, its broadcast address, and the range of valid host addresses for its subnet.

A Core Skill of the 100-101 Exam: Variable Length Subnet Masking (VLSM)

Variable Length Subnet Masking (VLSM) is an advanced subnetting technique that was a key topic on the 100-101 exam. VLSM allows a network administrator to use different subnet masks for different subnets within the same major network. This is an incredibly efficient way to use a limited IP address space. For example, you might have a network that requires several small subnets for different office departments, but you also need a very small subnet for the point-to-point link between two routers, which only needs two addresses.

With VLSM, you can take a large block of addresses, subnet it to create your larger subnets, and then take one of those new subnets and subnet it again with a different mask to create your even smaller subnets. The 100-101 exam would present you with a set of requirements for a network, including the number of hosts needed in several different subnets, and you would have to create an efficient VLSM addressing plan to meet those needs.

Introduction to IPv6 Addressing

While the vast majority of the addressing questions on the 100-101 exam focused on IPv4, it also introduced the next generation of the Internet Protocol: IPv6. Due to the exhaustion of the IPv4 address space, the adoption of IPv6 is critical for the continued growth of the internet. An IPv6 address is a 128-bit number, which provides a virtually limitless number of addresses.

For the 100-101 exam, a candidate was not expected to perform complex IPv6 subnetting. However, they were expected to have a foundational understanding of the IPv6 address format, which is represented as eight groups of four hexadecimal digits. They also needed to know the rules for abbreviating IPv6 addresses to make them easier to read, and to be able to recognize the different types of IPv6 addresses, such as a global unicast address or a link-local address.

Introduction to LAN Switching

The second major domain of the 100-101 exam was focused on the technologies that are used to build a Local Area Network (LAN). The central device in any modern LAN is the switch. As discussed in Part 1, a switch is a Layer 2 device that makes intelligent forwarding decisions based on the destination MAC address in an Ethernet frame. The 100-101 exam required a deep and practical understanding of how a switch operates.

A candidate needed to be able to explain how a switch builds its MAC address table by inspecting the source MAC address of incoming frames. They also needed to understand the process a switch follows when it receives a frame: it looks up the destination MAC address in its table, and if it finds a match, it forwards the frame only to the corresponding port. If it does not find a match, it will flood the frame to all ports except the one it came in on. This fundamental behavior is the key to how a switch segments a network into separate collision domains.

Navigating the Cisco IOS Command Line Interface (CLI)

To configure and manage a Cisco switch or router, a network engineer uses the Cisco Internetwork Operating System (IOS) Command Line Interface (CLI). Proficiency with the CLI was an absolute requirement for passing the 100-101 exam, as many questions were presented in the form of simulations where a candidate had to perform a hands-on configuration task. The CLI is a text-based interface that provides complete control over the device.

The 100-101 exam required a candidate to be comfortable with the different modes of the CLI. This includes user EXEC mode for basic monitoring, privileged EXEC mode for administrative tasks, and global configuration mode for changing the device's configuration. A key skill was knowing how to use the built-in help features of the CLI, such as the question mark (?) to see available commands, and how to use tab completion to speed up the configuration process.

Basic Switch Configuration and Management

The 100-101 exam tested on a variety of basic switch configuration tasks that are part of the day-to-day job of a network administrator. This starts with the initial out-of-the-box setup. A candidate needed to know how to assign a hostname to the switch, how to set the privileged EXEC mode password to secure administrative access, and how to configure a management IP address on the switch.

This management IP address is assigned to a logical interface called a Switched Virtual Interface (SVI). This allows the administrator to connect to the switch remotely over the network using protocols like Telnet or SSH, rather than having to be physically connected to its console port. The 100-101 exam would often present a simulation where you were required to perform these initial configuration steps to make a new switch ready for remote management.

Securing the Switch: Port Security and SSH

Basic network security was an important topic on the 100-101 exam. For a switch, this starts with securing access to its management interface. While Telnet can be used for remote management, it is an insecure protocol because it sends all data, including passwords, in clear text. The best practice is to configure Secure Shell (SSH), which encrypts the entire management session. The exam required you to know the steps to configure SSH on a switch.

Another key security feature tested was port security. Port security is a Layer 2 feature that allows an administrator to restrict the input to a switch interface by limiting the MAC addresses that are allowed to send traffic on that port. You can configure a port to allow only a specific MAC address, or to dynamically learn a certain number of addresses. If a violation occurs, you can configure the port to shut down, protecting the network from unauthorized devices.

Understanding Virtual LANs (VLANs)

Virtual LANs, or VLANs, are a fundamental technology for segmenting a switched network, and they were a major topic on the 100-101 exam. A VLAN is a logical grouping of switch ports that creates a single broadcast domain. By default, all ports on a switch are in the same VLAN, which means that a broadcast frame sent by one device will be received by all other devices on the switch.

By creating multiple VLANs, you can break the network into smaller, isolated broadcast domains. For example, you could place all the computers for the Sales department in a "Sales" VLAN and all the computers for the Engineering department in an "Engineering" VLAN. Devices in the Sales VLAN would not be able to communicate directly with devices in the Engineering VLAN without going through a Layer 3 router. This is essential for security and for improving network performance.

Configuring Trunks with the 802.1Q Protocol

When you have multiple VLANs that need to span across multiple switches, you need a way to connect those switches together. This is done using a trunk link. A trunk is a special type of switch port that is configured to carry traffic for multiple VLANs simultaneously. This was a critical configuration task for the 100-101 exam. The industry-standard protocol for trunking is IEEE 802.1Q.

The 802.1Q protocol works by adding a small "tag" to each Ethernet frame as it travels across the trunk link. This tag contains the VLAN ID, which tells the receiving switch which VLAN the frame belongs to. The 100-101 exam required a candidate to know the commands to configure a switch port as a trunk and to specify which VLANs are allowed to be carried across that trunk.

A Key Topic for the 100-101 Exam: The Spanning Tree Protocol (STP)

To provide redundancy in a switched network, it is common to have multiple physical paths between switches. However, this creates a problem at Layer 2 called a switching loop. A switching loop can cause broadcast frames to be forwarded endlessly around the network, quickly consuming all the available bandwidth and bringing the network to a halt. To prevent this, switches use the Spanning Tree Protocol (STP). This was a very important concept for the 100-101 exam.

STP is a protocol that runs on all switches and its job is to detect and prevent loops in the network. It does this by logically blocking some of the redundant ports. If the primary path fails, STP will automatically unblock the previously blocked port to restore connectivity. The 100-101 exam required a foundational understanding of how STP works, including the process it uses to elect a root bridge and to determine which ports should be in a forwarding or a blocking state.

The Role of a Router in an IP Network

While switches are used to connect devices within a single local area network, routers are the devices that connect different networks together. The second half of the 100-101 exam focused on the fundamentals of routing. A router is a Layer 3 device that makes its forwarding decisions based on the destination IP address in a packet. Each interface on a router is connected to a different IP network. The router's primary job is to receive a packet, look at its destination IP address, and then forward it out the correct interface to get it closer to its final destination.

To make these decisions, a router uses a routing table. The routing table is a list of all the networks that the router knows about and which interface should be used to reach them. The 100-101 exam required a deep understanding of this fundamental process of routing and the central role that the routing table plays in a router's operation.

Basic Router Configuration and Interface Setup

Similar to the switch section, the 100-101 exam required a candidate to be able to perform the basic configuration of a Cisco router using the IOS command line. This included setting a hostname, securing the device with passwords, and configuring remote management with SSH. The most important initial task for a router is to configure its interfaces. Unlike a switch port, a router interface is a Layer 3 interface that must be assigned an IP address and a subnet mask.

The 100-101 exam would often present a simulation where you were given a network diagram and an IP addressing plan, and you would be required to configure the IP addresses on the router's interfaces to match the diagram. A key command to know was the no shutdown command, which is required to enable the interface after it has been configured.

Understanding the IP Routing Table

The IP routing table is the brain of the router. The 100-101 exam required a candidate to be able to view the routing table using the show ip route command and to interpret its contents. The routing table contains a list of all the networks the router can reach. Each entry in the table includes the destination network and subnet mask, the IP address of the next router to send the packet to (the next hop), and the local interface to use to send the packet.

The routing table is populated in several ways. Directly connected networks, which are the networks that the router's own interfaces are configured on, are added automatically. An administrator can also manually add entries to the table by configuring static routes. Finally, the router can learn about remote networks automatically from other routers by using a dynamic routing protocol. The 100-101 exam covered all of these methods.

Configuring Static Routes

A static route is a route that is manually configured in the routing table by a network administrator. This was a key hands-on skill for the 100-101 exam. A static route tells the router that to reach a specific destination network, it must send the packet to a specific next-hop IP address. Static routes are very predictable and secure, as they are completely under the administrator's control.

They are often used in small networks or for configuring a "route of last resort," known as a default route. A default route is a special type of static route that tells the router where to send a packet if it does not have a more specific match in its routing table. This is commonly used to direct all internet-bound traffic to the company's internet service provider. The 100-101 exam required proficiency in configuring both specific and default static routes.

Introduction to Dynamic Routing with RIPv2

While static routes work well in small networks, they do not scale to large, complex environments. For larger networks, routers use a dynamic routing protocol to automatically learn about remote networks from each other. The 100-101 exam introduced the concept of dynamic routing using a simple protocol called Routing Information Protocol version 2 (RIPv2).

With a dynamic routing protocol, routers exchange routing information with their neighbors. When a router learns about a new network from a neighbor, it adds that network to its own routing table. This allows the routers to automatically build and maintain a complete view of the network topology. If a link in the network fails, the routers can automatically detect the change and find an alternate path. While RIPv2 is now obsolete, it served as an excellent introduction to the core concepts of dynamic routing.

Understanding Network Address Translation (NAT) and PAT

Because the number of public IPv4 addresses is limited, most organizations use private IP addresses on their internal network. However, these private addresses are not routable on the public internet. To allow internal users to access the internet, the router at the edge of the network must perform Network Address Translation, or NAT. This was a very important concept for the 100-101 exam.

NAT is the process of translating a private source IP address into a public source IP address as a packet leaves the network. The most common form of NAT is Port Address Translation, or PAT, also known as NAT Overload. PAT allows many internal private IP addresses to be translated to a single public IP address. It does this by keeping track of the source port number for each connection. The 100-101 exam required an understanding of how NAT and PAT work and the basic commands to configure them on a Cisco router.

Introduction to Wide Area Network (WAN) Technologies

The 100-101 exam also provided a brief introduction to the technologies that are used to connect networks over a wide geographical area, known as a Wide Area Network (WAN). This included a conceptual understanding of different WAN connection types, such as leased lines, which provide a dedicated point-to-point connection, and circuit-switched or packet-switched networks.

The exam touched on the protocols that are commonly used on these WAN links, such as the Point-to-Point Protocol (PPP) and High-Level Data Link Control (HDLC). While the 100-101 exam did not go into deep configuration of these technologies, it was important for a candidate to have a foundational understanding of the difference between a LAN and a WAN and the general technologies used to build a WAN.

Why the Cisco Certification Path Changed in 2020

The decision by Cisco to overhaul its entire certification program in February 2020, which led to the retirement of the 100-101 exam and the CCENT, was a direct response to the evolution of the networking industry. The role of the network engineer had changed. It was no longer enough to just understand routing and switching. The modern network engineer also needs to have skills in security, wireless networking, and, increasingly, network automation.

The old model, with its many different CCNA specializations, was seen as too complex and fragmented. The new program was designed to be more streamlined and to better reflect the real-world skills that employers are looking for today. It created a single, foundational CCNA that covers a broader range of topics, providing a more well-rounded skill set for the entry-level network professional. The goal was to create a certification that was more relevant to the modern job role.

Key Topics from the 100-101 Exam that Endure in the New CCNA

While the exam number has changed, the core knowledge from the 100-101 exam is still the absolute heart of the new CCNA (200-301) exam. The fundamental principles of networking do not change. A candidate for the new CCNA must still have a rock-solid understanding of the OSI and TCP/IP models. The requirement to be able to perform IPv4 subnetting quickly and accurately has not gone away; it is still one of the most critical skills you must master.

All the foundational knowledge of switching, including VLANs, trunks, and the Spanning Tree Protocol, is still a major part of the curriculum. Similarly, the fundamentals of routing, including how a router makes forwarding decisions using a routing table, static routing, and the principles of dynamic routing, are all still there. The knowledge validated by the 100-101 exam was not discarded; it was simply incorporated as the essential foundation of the new, broader CCNA.

New Topics in the Modern CCNA: Automation and Security

The new CCNA builds on the foundation of the 100-101 exam by adding several new domains that are critical for the modern network engineer. The two most significant of these are Security Fundamentals and Automation and Programmability. The security section goes beyond the basic device hardening of the old exam and introduces a broader set of security concepts. This includes understanding different threat vectors, the components of a security information and event management (SIEM) system, and the basics of VPNs and firewalls.

The most revolutionary change is the introduction of network automation. The modern network engineer is expected to be able to use scripts and software to automate repetitive tasks and to manage the network in a more efficient, code-driven way. The new CCNA introduces the foundational concepts of this new paradigm, which is a massive shift from the purely manual CLI configuration model of the 100-101 exam.

Introduction to Network Automation and Programmability

The Automation and Programmability section of the new CCNA is a direct reflection of the biggest trend in the networking industry. This domain introduces candidates to the concepts that are transforming network management. It requires an understanding of how modern network devices can be managed through Application Programming Interfaces (APIs), specifically REST APIs, which use standard HTTP methods to interact with the device.

It also requires a basic understanding of the data formats that are used in these automated workflows, such as JSON. The exam introduces the concepts of configuration management tools like Puppet, Chef, and Ansible, which allow engineers to define the state of their network in code and automatically enforce that state. While a candidate is not expected to be a programmer, they must understand these concepts and be able to interpret basic Python scripts.

Modern Security Fundamentals

The Security Fundamentals domain of the new CCNA significantly expands on the security topics that were covered in the 100-101 exam. It requires a candidate to be able to describe common security threats and vulnerabilities. It also tests on the technologies that are used to mitigate these threats. This includes an understanding of Access Control Lists (ACLs), which are used to filter traffic on a router, and the fundamentals of Virtual Private Networks (VPNs) for creating secure remote access and site-to-site connections.

The exam also requires a knowledge of modern wireless security protocols, such as WPA2 and WPA3. It emphasizes the importance of a layered security approach and ensures that a newly certified CCNA has the foundational knowledge to contribute to the security of their network, a topic that has become a top priority for every organization.

Conclusion

Preparing for the new CCNA (200-301) exam requires a study plan that covers both the timeless fundamentals from the 100-101 exam and the new modern topics. You must still dedicate a significant amount of time to mastering IP addressing and subnetting. Hands-on practice with the Cisco CLI for configuring switches and routers is just as important as it ever was. Using a simulator like Cisco Packet Tracer or a more advanced emulator is essential for building these practical skills.

In addition to these traditional topics, your study plan must now also include dedicated time for the new domains. You will need to study the fundamentals of network security and spend time learning the basic concepts of network automation and programmability. This might involve watching introductory videos on REST APIs and JSON, or even trying to write a few simple Python scripts. A well-rounded study plan that covers all the exam blueprint domains is the key to success.

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