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Question 161

What is the primary function of a network bridge?

1. Routing packets across disparate wide area network boundaries.
2. Connecting multiple local network segments while filtering frame traffic.
3. Encrypting management traffic over insecure remote Telnet sessions.
4. Dynamically leasing IP addresses to client workstations on demand.

Correct Answer: 2

Explanation:

A network bridge is a traditional Layer 2 networking device designed to connect two or more separate local network segments into a single unified broadcast domain. Unlike simple hubs that broadcast all electrical signals indiscriminately, a bridge examines the source and destination MAC addresses of incoming Ethernet frames and builds an internal filtering database. By tracking which devices reside on which segment, the bridge forwards frames selectively only to the appropriate segment where the destination host is located, reducing unnecessary traffic congestion and improving overall network efficiency across the interconnected physical media.

Question 162

Which command displays the active configuration currently stored in RAM?

1. show startup-config
2. show version
3. show running-config
4. show flash

Correct Answer: 3

Explanation:

The show running-config command is an essential diagnostic and verification command executed in privileged EXEC mode within the Cisco IOS command-line interface. It displays the complete configuration file currently residing in the device’s random-access memory, representing all active parameters, interface assignments, routing protocols, access control lists, and security settings currently governing device operations. Network engineers examine the running configuration to verify recent changes before saving them to non-volatile random-access memory using the write memory or copy running-config startup-config commands.

Question 163

What protocol resolves human-readable domain names into numerical IP addresses?

1. Dynamic Host Configuration Protocol
2. Address Resolution Protocol
3. Simple Network Management Protocol
4. Domain Name System

Correct Answer: 4

Explanation:

The Domain Name System is a hierarchical and decentralized naming system used to translate human-readable fully qualified domain names into numerical IPv4 or IPv6 addresses required for network routing and host identification. Because remembering complex numerical IP addresses is impractical for human users, DNS servers map user-friendly names to their corresponding network addresses automatically. When a user enters a web address or application hostname into a system, a DNS query is dispatched to resolve the name into an actionable IP address, facilitating seamless communication across local area networks and the global internet infrastructure without manual intervention.

Question 164

Which OSI layer handles reliable end-to-end data delivery?

1. Physical Layer
2. Transport Layer
3. Network Layer
4. Data Link Layer

Correct Answer: 2

Explanation:

The Transport layer, which is Layer 4 of the OSI reference model, is fundamentally responsible for providing reliable, transparent, and error-checked end-to-end data delivery between communicating hosts. Protocols operating at this layer, such as Transmission Control Protocol, establish connection-oriented sessions, implement flow control mechanisms, utilize windowing to optimize bandwidth utilization, and perform error detection and retransmission of lost segments. This ensures that application data streams are delivered accurately, in correct sequence, and without corruption regardless of the underlying physical network infrastructure traversed.

Question 165

What is the default subnet mask for a Class C network?

1. 255.255.255.0
2. 255.0.0.0
3. 255.255.0.0
4. 255.255.255.255

Correct Answer: 1

Explanation:

In traditional classful IPv4 addressing, Class C networks are designated for small-scale networks and utilize a default subnet mask of 255.255.255.0. In binary representation, this corresponds to twenty-four network bits followed by eight host bits. This mask indicates that the first three octets of the IP address identify the specific network segment, while the final octet is available for host device identification. This configuration allows a maximum of 254 usable host IP addresses per network segment after reserving the network identifier and broadcast addresses.

Question 166

Which networking device operates strictly at Layer 1 of the OSI model?

1. Layer 2 Ethernet Switch
2. Traditional Network Hub
3. Enterprise Core Router
4. Multilayer Switch

Correct Answer: 2

Explanation:

A traditional network hub operates strictly at Layer 1, the physical layer of the OSI model. When a hub receives an electrical or optical signal on one of its ports, it simply regenerates that signal and broadcasts it out all other active ports without examining header information, MAC addresses, or packet contents. Because hubs do not filter traffic or establish separate collision domains, all connected devices share a single collision domain and a single broadcast domain, leading to increased contention, potential frame collisions, and performance degradation in busy network environments.

Question 167

What command verifies interface status and operational protocol states?

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

Correct Answer: 3

Explanation:

The show ip interface brief command is one of the most frequently utilized diagnostic commands within the Cisco IOS command-line interface. When executed, it generates a concise summary table displaying all physical and logical interfaces on the device, their assigned IPv4 addresses, physical layer operational status, and data link protocol states. Network engineers rely on this command during initial deployments and troubleshooting procedures to verify whether ports are up or down, confirm IP address configurations, and rapidly identify interface failures or misconfigurations across routers and multilayer switches.

Question 168

Which IEEE standard governs wireless local area network technologies?

1. IEEE 802.3
2. IEEE 802.1Q
3. IEEE 802.1X
4. IEEE 802.11

Correct Answer: 4

Explanation:

The IEEE 802.11 standard family defines the physical layer and media access control specifications for wireless local area networks. Over decades of technological evolution, 802.11 has expanded to encompass numerous amendments providing increasing data throughput rates, enhanced security protocols, and advanced radio frequency management across the 2.4 GHz, 5 GHz, and 6 GHz spectrum bands. In contrast, IEEE 802.3 governs wired Ethernet local area networks, IEEE 802.1Q specifies Virtual Local Area Network tagging on Ethernet frames, and IEEE 802.1X provides port-based network access control authentication mechanisms.

Question 169

What protocol assigns dynamic IP configuration parameters to client hosts?

1. Dynamic Host Configuration Protocol
2. Domain Name System
3. Address Resolution Protocol
4. Network Time Protocol

Correct Answer: 1

Explanation:

The Dynamic Host Configuration Protocol is a network management protocol used to automate the configuration of devices connected to an IP network. Instead of manually assigning static IP addresses, subnet masks, default gateways, and DNS server addresses to every individual workstation, a DHCP server leases these configuration parameters dynamically from a predefined address pool. This eliminates manual configuration errors, optimizes IP address utilization through temporary lease expirations, and simplifies network administration across enterprise environments, allowing seamless client onboarding and mobility.

Question 170

Which switching method checks the frame check sequence before forwarding?

1. Cut-through switching
2. Fragment-free switching
3. Store-and-forward switching
4. Direct-access switching

Correct Answer: 3

Explanation:

In store-and-forward switching, the switch receives the entire Ethernet frame into its internal memory buffer before taking any forwarding action. Once the complete frame is received, the switch performs a Cyclic Redundancy Check by analyzing the Frame Check Sequence trailer to verify frame integrity, checking for mathematical errors, corrupted bits, and runt frames. Only if the frame passes validation does the switch examine the destination MAC address, look up the forwarding table, and forward the frame out the appropriate egress port, ensuring error-free transmission across the network.

Question 171

What is the primary purpose of IPv4 subnet masks?

1. Encrypting payload data across insecure wireless links.
2. Identifying network and host portions of an IP address.
3. Automatically assigning dynamic IP addresses to workstations.
4. Translating private internal IP addresses into public addresses.

Correct Answer: 2

Explanation:

An IPv4 subnet mask is a 32-bit number paired with an IP address to divide that address into two specific components: the network identifier and the host identifier. By utilizing contiguous binary ones to represent the network portion and binary zeros to represent the host portion, the subnet mask enables routers and participating hosts to determine whether a destination IP address resides on the local network segment or requires routing through an external gateway. This logical boundary definition is essential for efficient packet forwarding, local broadcast identification, and structured IP address management across enterprise networks.

Question 172

Which routing protocol uses bandwidth and delay as default metrics?

1. Routing Information Protocol
2. Open Shortest Path First
3. Enhanced Interior Gateway Routing Protocol
4. Border Gateway Protocol

Correct Answer: 3

Explanation:

The Enhanced Interior Gateway Routing Protocol is an advanced distance-vector routing protocol developed by Cisco that utilizes a sophisticated composite metric to determine the optimal path to a destination network. Unlike the Routing Information Protocol, which relies strictly on hop count, EIGRP calculates its composite metric based on configurable parameters including bandwidth, delay, reliability, and load, with bandwidth and cumulative delay serving as the default operational components by design. This multi-parameter metric calculation allows EIGRP to select superior, highly efficient paths across complex enterprise network topologies and achieve rapid convergence times.

Question 173

What type of IPv6 address is fe80::1?

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

Correct Answer: 4

Explanation:

An IPv6 Link-Local Address is automatically configured on all IPv6-enabled interfaces as soon as the protocol is initialized, utilizing the reserved prefix fe80::/10. Link-local addresses are strictly non-routable, meaning routers will never forward packets containing link-local source or destination addresses outside the local network segment. These addresses are essential for fundamental neighbor discovery, router solicitation, and basic local communication between neighboring nodes on the exact same physical or logical link before global or unique local addressing is established, ensuring local connectivity.

Question 174

Which TCP flag indicates connection teardown initiation?

1. SYN
2. FIN
3. ACK
4. RST

Correct Answer: 2

Explanation:

The Finish flag is utilized within the Transmission Control Protocol header to initiate the graceful teardown and termination of an established connection between two communicating network hosts. When a host has completed data transmission and wishes to close the session, it sends a segment containing the FIN flag. The receiving host acknowledges the termination request and eventually transmits its own FIN segment to close the reverse data stream. Once both directions of the connection are acknowledged and closed, the session resources are released, ensuring reliable and orderly communication cleanup.

Question 175

What is the maximum segment length for standard UTP copper cabling?

1. 50 meters
2. 185 meters
3. 100 meters
4. 500 meters

Correct Answer: 3

Explanation:

According to ANSI/TIA and ISO/IEC cabling standards, the maximum allowable length for a horizontal unshielded twisted pair or shielded twisted pair copper cable run in an Ethernet network is 100 meters. This specific limit comprises a maximum of 90 meters of permanent solid-core link cable installed within building walls or cable trays, combined with a maximum of 10 meters of stranded patch cables utilized at the telecommunications closet and workstation ends. Exceeding this 100-meter threshold introduces excessive signal attenuation, propagation delay, and jitter, leading to high bit error rates and dropped packets across the connection.

Question 176

Which protocol reports network error conditions and operational diagnostics?

1. Internet Control Message Protocol
2. Address Resolution Protocol
3. Dynamic Host Configuration Protocol
4. Transmission Control Protocol

Correct Answer: 1

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 177

What command displays active IP routing table entries on routers?

1. show running-config
2. show ip route
3. show interfaces brief
4. show ip arp

Correct Answer: 2

Explanation:

The show ip route command is one of the most frequently utilized diagnostic commands within the Cisco IOS command-line interface. When executed in privileged EXEC mode, it displays the router’s current active IP routing table. This output details directly connected networks, static routes, and dynamically learned routes via protocols like OSPF or EIGRP. Network engineers examine this table to verify route metrics, next-hop IP addresses, exit interfaces, and administrative distances, making it an indispensable tool for troubleshooting reachability issues, validating routing protocol convergence, and verifying network path selection.

Question 178

Which cable type resists electrical interference entirely using light pulses?

1. Unshielded Twisted Pair
2. Shielded Twisted Pair
3. Coaxial Cable
4. Fiber Optic Cable

Correct Answer: 4

Explanation:

A fiber optic cable consists of one or more extremely thin strands of glass or plastic fiber encased in protective cladding and outer jackets. Data is transmitted across fiber optic cables as pulses of light generated by lasers or light-emitting diodes. Because optical transmission relies entirely on light rather than electrical current, fiber optic cables are completely immune to electromagnetic interference and radio frequency interference generated by power lines, motors, or fluorescent lighting. They support significantly higher bandwidth capacities and much longer transmission distance limitations compared to copper-based media.

Question 179

What protocol secures remote device management sessions over encrypted connections?

1. Telnet
2. HTTP
3. Secure Shell
4. Simple Network Management Protocol

Correct Answer: 3

Explanation:

Secure Shell is a cryptographic network protocol designed for operating network services securely over an unsecured network. In enterprise networking environments, SSH is utilized as a secure replacement for legacy Telnet sessions when network administrators remotely log into routers, switches, and firewalls to execute command line configurations. Unlike Telnet, which transmits all authentication credentials, usernames, passwords, and command keystrokes in plain text across the network where they can be intercepted easily, SSH encrypts all transmitted data streams using advanced cryptographic algorithms. This ensures that sensitive management traffic remains completely private and protected against unauthorized eavesdropping and man-in-the-middle attacks across both local and wide area networks.

Question 180

Which networking device creates separate collision domains for each port?

1. Network Hub
2. Layer 2 Switch
3. Passive Patch Panel
4. Coaxial Repeater

Correct Answer: 2

Explanation:

A Layer 2 switch isolates collision domains by treating every individual switch port as an independent collision domain segment. Unlike legacy hubs where all connected devices share a single collision domain and contend for media access, a switch buffers frames and manages transmission access per port. This architectural advantage allows full-duplex communication where devices can transmit and receive data simultaneously without experiencing frame collisions, resulting in drastically improved network performance and throughput capacity across the local infrastructure.