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Question 201

What is the primary function of the Cisco IOS reload command?

1. Saving the active running configuration to persistent NVRAM memory.
2. Restarting the router or switch operating system.
3. Erasing all configuration files and returning the device to factory defaults.
4. Updating the Cisco IOS software image from a TFTP server.

Correct Answer: 2

Explanation:

The reload command is executed within privileged EXEC mode in the Cisco IOS command-line interface to restart the network device. When invoked, the operating system initiates a system reboot procedure, which flushes volatile random-access memory and reinitializes hardware components, reloading the startup configuration file from non-volatile memory. Network administrators utilize the reload command after making major system modifications, upgrading IOS firmware images, or verifying that device boot sequences operate correctly.

Question 202

Which IPv6 address type is used to transmit packets to multiple destination interfaces simultaneously within a scope?

1. Global Unicast Address
2. Link-Local Address
3. Multicast Address
4. Unique Local Address

Correct Answer: 3

Explanation:

An IPv6 multicast address is utilized to transmit a single packet to multiple destination interfaces simultaneously, typically belonging to a specific multicast group of nodes. Unlike unicast addresses that deliver packets to a single interface or broadcast addresses which are absent in IPv6 architecture, multicast addresses use the reserved prefix ff00::/8 to distribute data efficiently to interested subscribers across local or routed network segments without flooding every device on the network.

Question 203

What Cisco Discovery Protocol command displays detailed neighbor device information such as platform model, software version, and connected interfaces?

1. show ip route
2. show cdp neighbors detail
3. show interfaces brief
4. show running-config

Correct Answer: 2

Explanation:

The show cdp neighbors detail command is an invaluable diagnostic tool executed within the Cisco IOS command-line interface to gather comprehensive telemetry regarding directly connected Cisco devices. While the standard show cdp neighbors command provides a basic summary table of adjacent device IDs and local port connections, appending the detail keyword reveals critical operational data including remote management IP addresses, platform model numbers, IOS software versions, native VLAN settings, and duplex capabilities.

Question 204

Which protocol operates over UDP port 69 and is commonly used for transferring configuration files and IOS images without authentication?

1. Secure File Transfer Protocol
2. File Transfer Protocol
3. Trivial File Transfer Protocol
4. Hypertext Transfer Protocol

Correct Answer: 3

Explanation:

Trivial File Transfer Protocol is a simplified, lightweight file transfer protocol operating over User Datagram Protocol port 69. Because TFTP lacks complex user authentication, session control, and directory browsing features found in standard FTP, it is utilized primarily within controlled local enterprise environments for routine tasks such as backing up router configuration files, transferring small script files, and downloading new Cisco IOS software images during system recovery or upgrade procedures.

Question 205

What is the primary purpose of Cisco PortFast technology on switch access ports?

1. Encrypting data frames across local physical trunk links.
2. Bypassing standard Spanning Tree Protocol listening and learning states to transition ports immediately to forwarding.
3. Automatically assigning dynamic IP address leases to client workstations.
4. Limiting switch port access based on registered MAC addresses.

Correct Answer: 2

Explanation:

Cisco PortFast is a spanning tree feature configured on switch ports connected directly to end-user workstations or servers. Normally, when a switch port connects to the network, STP forces the port through listening and learning states to prevent temporary loops, introducing a thirty-to-fifty second delay before data can pass. Enabling PortFast allows the port to transition immediately from blocking to forwarding state upon link-up, preventing client DHCP timeout issues while maintaining loop protection on uplinks.

Question 206

Which IPv4 subnet mask corresponds to a CIDR prefix of /28?

1. 255.255.255.192
2. 255.255.255.224
3. 255.255.255.240
4. 255.255.255.248

Correct Answer: 3

Explanation:

A /28 CIDR prefix indicates that twenty-eight contiguous bits of an IPv4 subnet mask are set to binary one, leaving four bits for host identification. Converting the final octet where the remaining four bits reside from binary 11110000 to decimal yields 240, establishing 255.255.255.240 as the complete subnet mask. This subnet division yields sixteen total addresses per subnet, of which fourteen are usable for host device assignment after accounting for the network identifier and broadcast addresses.

Question 207

What protocol does the traceroute utility use by default when operating in a Cisco IOS environment?

1. Transmission Control Protocol
2. User Datagram Protocol
3. Address Resolution Protocol
4. Internet Control Message Protocol

Correct Answer: 2

Explanation:

In Cisco IOS, the traceroute command utilizes User Datagram Protocol packets by default, whereas standard operating system traceroute utilities often rely on ICMP. Cisco traceroute sends UDP datagrams addressed to high, unassigned destination port numbers, incrementing the Time to Live value starting from one. As intermediate routers drop the packets and return ICMP Time Exceeded messages, the router maps the network path. Once the packets reach the destination host, an ICMP Port Unreachable message confirms completion of the trace route.

Question 208

Which TCP mechanism ensures that a fast transmitting sender does not overwhelm a slow receiving host with excessive data streams?

1. Three-way handshake
2. Flow control via windowing
3. Cyclic redundancy checking
4. Route poisoning

Correct Answer: 2

Explanation:

Flow control, implemented via sliding window mechanisms within the Transmission Control Protocol, regulates the rate of data transmission between communicating hosts. The receiving host advertises its available buffer capacity—known as the window size—within TCP acknowledgments. This informs the transmitting host how many bytes it can send before requiring explicit acknowledgment, preventing buffer overflow, packet drops, and retransmission storms when mismatched processing speeds exist between endpoints.

Question 209

What is the primary function of a static route configured on a router?

1. Dynamically discovering optimal paths using link-state advertisements.
2. Providing a manually configured path for packets destined for specific remote networks.
3. Automatically translating private internal IP addresses into public routable IPs.
4. Allocating dynamic IP address leases to client workstations on demand.

Correct Answer: 2

Explanation:

A static route is a manually configured routing entry entered by a network administrator into a router’s configuration. It explicitly directs traffic destined for a specific remote network subnet toward a designated next-hop IP address or exit interface. Static routes are ideal for stub networks, small enterprise environments, or providing secure default gateway paths where dynamic routing protocols introduce unnecessary administrative overhead or resource consumption.

Question 210

Which switching method examines the destination MAC address and forwards the frame immediately without waiting for the rest of the frame or checking FCS?

1. Store-and-forward switching
2. Fragment-free switching
3. Cut-through switching
4. CRC validation switching

Correct Answer: 3

Explanation:

In cut-through switching, the switch reads only the first six bytes of an incoming Ethernet frame—specifically the destination MAC address—and immediately looks up its internal forwarding table to route the frame out the appropriate egress port without waiting for the rest of the frame to arrive. This method minimizes latency significantly compared to store-and-forward switching. However, because cut-through switches do not buffer the entire frame or perform Cyclic Redundancy Check validation, they can inadvertently propagate corrupted frames and runt collisions across the network.

Question 211

What is the decimal value of the binary octet 11000000?

1. 128
2. 192
3. 224
4. 240

Correct Answer: 2

Explanation:

To convert the binary octet 11000000 to decimal, calculate the sum of the powers of two corresponding to each bit position containing a binary one, moving from right to left starting at two to the power of zero. The left-most bit represents 128 and the second bit represents 64. Adding 128 and 64 together yields a total decimal value of 192. This value represents the exact boundary value utilized in various IPv4 subnet masks, such as /26 prefixes, and serves as a fundamental building block in binary arithmetic calculations for network engineering and IP subnet design.

Question 212

Which command displays active Virtual Terminal lines configuration and current remote login sessions?

1. show running-config
2. show ip interface brief
3. show users
4. show ip route

Correct Answer: 3

Explanation:

The show users command executed within privileged EXEC mode on Cisco devices lists all active administrative sessions currently connected to the router or switch, including console lines and virtual terminal (vty) lines. It displays user line numbers, originating IP addresses or terminal connections, idle time counters, and active session tasks. Network administrators utilize this command to audit active management connections and verify remote SSH or Telnet session statuses.

Question 213

What flash memory characteristic distinguishes it from RAM and NVRAM in Cisco hardware architecture?

1. It is volatile and loses all stored data whenever power is interrupted.
2. It stores the active running configuration file during device operation.
3. It provides non-volatile storage used to hold Cisco IOS software images and firmware files.
4. It contains the bootstrap startup configuration file persistently.

Correct Answer: 3

Explanation:

Flash memory is a type of non-volatile computer storage used inside Cisco routers and switches to store the Cisco IOS operating system software images, microcode, and boot files. Unlike RAM, which is volatile and loses contents upon reboot, or NVRAM, which stores the startup configuration file, flash memory retains large software packages across power cycles and allows firmware updates to be loaded into RAM during the device boot sequence.

Question 214

Which DNS record type is utilized to map a domain name to an IPv6 address?

1. A Record
2. AAAA Record
3. PTR Record
4. MX Record

Correct Answer: 2

Explanation:

An AAAA record, often pronounced “quad-A,” is a core Domain Name System resource record used to map a human-readable fully qualified domain name to its corresponding 128-bit IPv6 address. While standard A records handle traditional 32-bit IPv4 address resolutions, AAAA records provide essential name resolution capabilities in modern dual-stack and pure IPv6 network environments, enabling clients to discover and connect to servers using IPv6 addressing.

Question 215

What is the default administrative distance assigned to a static route in Cisco IOS?

1. 0
2. 1
3. 90
4. 110

Correct Answer: 2

Explanation:

Administrative distance represents the trustworthiness or preference level of a routing information source, where lower values indicate higher reliability in path selection. In Cisco IOS routing architecture, static routes are assigned a default administrative distance of 1. This positions static routes as highly preferred over dynamic routing protocols like EIGRP at 90, OSPF at 110, and RIP at 120, while remaining less preferred than directly connected interface routes which hold an administrative distance of 0.

Question 216

What protocol is used by network devices to report error messages and operational feedback, such as packet delivery failures?

1. Address Resolution Protocol
2. Internet Control Message Protocol
3. Dynamic Host Configuration Protocol
4. Simple Network Management Protocol

Correct Answer: 2

Explanation:

The Internet Control Message Protocol is a core auxiliary protocol utilized within the Internet Protocol suite for diagnostic, error reporting, and operational testing purposes. Network engineers and automated systems rely on ICMP echo request and reply messages to test connectivity, while ICMP error reporting messages are generated automatically by routers and hosts when packet delivery fails. Examples include destination unreachable alerts, time exceeded notifications for expired TTL counters, and source quench messages, providing vital feedback for troubleshooting and maintaining healthy network operations.

Question 217

Which OSI layer is responsible for establishing, managing, and terminating presentation sessions between applications?

1. Physical Layer
2. Transport Layer
3. Session Layer
4. Application Layer

Correct Answer: 3

Explanation:

The Session layer, which is Layer 5 of the OSI reference model, is responsible for establishing, managing, and terminating communication sessions between interacting applications across a network. It handles session checkpoints, dialog control to determine which party transmits data at a given time, and recovery procedures if communication sessions are interrupted. This layer ensures that application-level dialogues remain synchronized and orderly throughout data exchange sessions.

Question 218

What is the primary purpose of subnet zero or subnet allocation practices in modern IP design?

1. Encrypting payload data across wireless local links.
2. Eliminating historical restrictions on using the first and last subnets derived from subnetting, maximizing available sub-networks.
3. Automatically assigning dynamic IP leases to client workstations.
4. Translating private internal addresses into public routable IPs.

Correct Answer: 2

Explanation:

Historically, early internet engineering standards discouraged utilizing the first subnet (subnet zero) and the last subnet (all ones subnet) to avoid confusion with network identifiers and broadcast addresses. However, modern RFC standards and Cisco IOS architectures fully support ip subnet-zero enabled by default, allowing network administrators to utilize every available subnet derived from binary borrowing. This maximizes IPv4 address efficiency and eliminates wasted network subnets in enterprise designs.

Question 219

Which Cisco IOS command displays detailed memory utilization, processor load averages, and system uptime statistics?

1. show running-config
2. show version
3. show ip interface brief
4. show cdp neighbors

Correct Answer: 2

Explanation:

The show version command executed within privileged EXEC mode on Cisco routers and switches displays vital hardware and software telemetry, including exact Cisco IOS software image version details, system uptime, configuration register settings, hardware model numbers, amount and type of system memory installed, and CPU statistics. Network engineers rely heavily on this command during diagnostic evaluations, inventory audits, and system stability checks.

Question 220

What is the maximum allowable cable length for standard 100BASE-TX Fast Ethernet unshielded twisted pair copper links?

1. 50 meters
2. 90 meters
3. 100 meters
4. 185 meters

Correct Answer: 3

Explanation:

According to ANSI/TIA structured cabling standards, the maximum allowable length for standard unshielded twisted pair copper cable runs—including Fast Ethernet (100BASE-TX) and Gigabit Ethernet (1000BASE-T)—is 100 meters per segment. This limit consists of a maximum of 90 meters of permanent horizontal solid-core cabling installed within building walls, combined with a maximum of 10 meters of stranded patch cables utilized at the patch panel and workstation ends. Exceeding this limit causes severe signal attenuation and jitter, leading to high packet error rates.