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Question: 361. Which protocol is used to discover the MAC address associated with an IPv4 address on a local network?

1. ARP
   2. DNS
   3. NTP
   4. DHCP

Correct Answer: 1. ARP

Explanation:

Address Resolution Protocol, or ARP, maps a known IPv4 address to the corresponding MAC address on a local Layer 2 network. When a host needs to send an IPv4 packet to another device on the same subnet, it may use ARP to determine the destination MAC address required to construct the Ethernet frame. DNS resolves hostnames, NTP synchronizes clocks, and DHCP provides network configuration. ARP is therefore an important mechanism for communication between IPv4 devices across an Ethernet network.

Question: 362. Which type of IPv6 address is automatically configured on an interface and is used for communication on the local link?

1. Global unicast
   2. Link-local
   3. Anycast
   4. Multicast

Correct Answer: 2. Link-local

Explanation:

IPv6 link-local addresses are used for communication between devices on the same local network segment. They are assigned from the FE80::/10 range and are commonly present on IPv6-enabled interfaces even when no globally routable IPv6 address has been configured. Link-local addresses are important for functions such as Neighbor Discovery and communication with local IPv6 routers. Global unicast addresses are routable beyond the local link, while multicast addresses identify groups of receivers. Anycast provides access to the nearest instance of a shared address.

Question: 363. What is the primary function of a DHCP lease?

1. Encrypt traffic between switches
   2. Identify a device’s MAC vendor
   3. Define how long a client can use assigned configuration information
   4. Prevent all routing loops

Correct Answer: 3. Define how long a client can use assigned configuration information

Explanation:

A DHCP lease specifies the period during which a client may use an IP address and associated DHCP configuration supplied by the server. Before the lease expires, the client normally attempts to renew it so that its configuration remains valid. Lease durations can be configured according to network requirements. DHCP does not encrypt switch traffic, identify MAC vendors, or prevent routing loops. Understanding leases is important when troubleshooting address allocation, expiration, renewal, and unexpected changes in client network configuration.

Question: 364. Which switching method begins forwarding an Ethernet frame before receiving the entire frame?

1. Store-and-forward
   2. Fragment-free
   3. Cut-through
   4. Broadcast forwarding

Correct Answer: 3. Cut-through

Explanation:

Cut-through switching allows a switch to begin forwarding a frame after reading enough of the frame to determine its destination, rather than waiting for the entire frame to arrive. This can reduce forwarding latency compared with store-and-forward switching. Store-and-forward switches receive the complete frame before forwarding it and can perform a full frame check. The choice between switching methods involves trade-offs involving latency and error handling. Therefore, cut-through is the switching method that can begin forwarding before receiving the complete frame.

Question: 365. Which protocol is commonly used to securely transfer files using an SSH-based connection?

1. TFTP
   2. SFTP
   3. SMTP
   4. SNMP

Correct Answer: 2. SFTP

Explanation:

SFTP, or SSH File Transfer Protocol, provides secure file transfer through an SSH connection. It encrypts the communication between the client and server and can be used to upload, download, and manage files securely. TFTP is a simple file-transfer protocol without comparable built-in security, SMTP is used for email transmission, and SNMP is primarily used for network management and monitoring. SFTP is therefore appropriate when secure file movement is required across a network.

Question: 366. What does a switch normally learn when examining the source MAC address of an incoming Ethernet frame?

1. The IP address of the default gateway
   2. The DNS server address
   3. The source MAC address and its associated ingress port
   4. The destination subnet mask

Correct Answer: 3. The source MAC address and its associated ingress port

Explanation:

Ethernet switches learn source MAC addresses by examining incoming frames. The switch records the source MAC address and associates it with the port on which the frame arrived. This information is stored in the switch’s MAC address table and allows future frames destined for that MAC address to be forwarded more efficiently. The switch does not learn a DNS server or subnet mask from the Ethernet source MAC field. MAC learning is therefore fundamental to normal Layer 2 switching behavior.

Question: 367. Which protocol is commonly used to monitor and manage network devices through management information and counters?

1. SNMP
   2. FTP
   3. SMTP
   4. ARP

Correct Answer: 1. SNMP

Explanation:

SNMP, or Simple Network Management Protocol, is commonly used to monitor and manage network infrastructure. Network management systems can use SNMP to retrieve information such as interface statistics, device status, and resource utilization. SNMP can also support certain configuration or control operations depending on the version and device implementation. FTP is used for file transfer, SMTP for email transmission, and ARP for IPv4 address resolution. SNMP is therefore the protocol most closely associated with network monitoring and management information.

Question: 368. Which VLAN type is commonly associated with carrying untagged traffic on an IEEE 802.1Q trunk?

1. Voice VLAN
   2. Management VLAN
   3. Native VLAN
   4. Private VLAN

Correct Answer: 3. Native VLAN

Explanation:

On an IEEE 802.1Q trunk, the native VLAN is traditionally associated with frames that are transmitted without an explicit VLAN tag. The exact behavior and configuration depend on the switch platform, and the native VLAN should be configured consistently between connected devices to avoid traffic problems or security concerns. A voice VLAN is used for voice-device traffic, a management VLAN can be used for device administration, and private VLANs provide specialized Layer 2 isolation. Therefore, the native VLAN is the relevant concept for untagged trunk traffic.

Question: 369. Which routing table entry generally has the longest prefix and therefore the highest specificity?

1. Default route
   2. Host route
   3. Summary route
   4. Static default gateway

Correct Answer: 2. Host route

Explanation:

A host route identifies a single IP address and therefore has the most specific prefix for that individual destination. In IPv4, a host route commonly uses a /32 prefix, while an IPv6 host route commonly uses /128. Routing decisions generally prefer the longest matching prefix when multiple routes match a destination. A default route has the least specific prefix, while summary routes intentionally represent broader address ranges. Understanding prefix specificity is essential when analyzing routing-table decisions.

Question: 370. Which IPv4 range is reserved for link-local addressing when a host cannot obtain an address through normal configuration?

1. 169.254.0.0/16
   2. 172.16.0.0/12
   3. 192.168.0.0/16
   4. 224.0.0.0/4

Correct Answer: 1. 169.254.0.0/16

Explanation:

The IPv4 range 169.254.0.0/16 is reserved for link-local addressing, commonly known as Automatic Private IP Addressing on some operating systems. A host may configure an address from this range when it cannot obtain a normal IPv4 address through DHCP. Link-local addresses are intended for communication on the local network and are not normally routed across routers. The other ranges represent private IPv4 addressing and multicast space. Therefore, 169.254.0.0/16 is the appropriate link-local range.

Question: 371. Which security technology can inspect traffic and enforce rules based on network connections and applications?

1. Hub
   2. Firewall
   3. Repeater
   4. Patch panel

Correct Answer: 2. Firewall

Explanation:

A firewall is designed to control network traffic according to configured security policies. Depending on its capabilities, a firewall can inspect source and destination addresses, ports, protocols, connection state, and application characteristics. It can permit or deny traffic based on these criteria. A hub simply repeats signals, a repeater regenerates signals, and a patch panel provides physical connectivity without performing traffic inspection. Firewalls are therefore an important component of network security and access control.

Question: 372. Which Ethernet standard is associated with Gigabit Ethernet over copper using twisted-pair cabling?

1. 1000BASE-T
   2. 100BASE-TX
   3. 10BASE-T
   4. 10GBASE-SR

Correct Answer: 1. 1000BASE-T

Explanation:

1000BASE-T is the Ethernet standard commonly associated with Gigabit Ethernet over copper twisted-pair cabling. It provides 1 Gbps Ethernet connectivity using suitable copper cabling and compatible network interfaces. 100BASE-TX provides Fast Ethernet at 100 Mbps, 10BASE-T provides 10 Mbps Ethernet, and 10GBASE-SR is a 10-Gigabit Ethernet technology designed for multimode fiber. Knowing Ethernet naming conventions helps administrators identify expected speeds, media types, and deployment requirements.

Question: 373. What is the main purpose of a subnet mask when a host determines whether a destination is local or remote?

1. It identifies the network portion of the address
   2. It encrypts the destination address
   3. It identifies the destination’s MAC vendor
   4. It assigns the host’s DNS server

Correct Answer: 1. It identifies the network portion of the address

Explanation:

A subnet mask identifies which bits of an IPv4 address represent the network portion and which represent the host portion. A host can compare its own network portion with the destination address to determine whether the destination is on the same local subnet. If the destination is local, the host can resolve the destination’s MAC address and communicate directly. If the destination is remote, the host normally sends the packet toward its default gateway. The subnet mask therefore plays an essential role in local-versus-remote destination decisions.

Question: 374. Which protocol is used by switches to prevent redundant Layer 2 paths from creating forwarding loops?

1. STP
   2. DNS
   3. DHCP
   4. NTP

Correct Answer: 1. STP

Explanation:

Spanning Tree Protocol, or STP, prevents Layer 2 switching loops by creating a loop-free logical topology. When redundant physical links exist, STP can place selected ports into a non-forwarding state while keeping those paths available as alternatives. Without loop prevention, Ethernet broadcasts and unknown unicast traffic could circulate repeatedly and potentially overwhelm the network. DNS, DHCP, and NTP provide name resolution, host configuration, and time synchronization respectively. They do not perform Layer 2 loop prevention.

Question: 375. Which IPv6 mechanism replaces ARP for address resolution?

1. DHCPv6
   2. Neighbor Discovery Protocol
   3. NAT64
   4. FTP

Correct Answer: 2. Neighbor Discovery Protocol

Explanation:

IPv6 does not use ARP. Instead, the Neighbor Discovery Protocol, operating through ICMPv6, provides functions including neighbor address resolution, router discovery, and duplicate address detection. Neighbor Solicitation and Neighbor Advertisement messages are used to determine the link-layer address associated with an IPv6 neighbor. DHCPv6 provides configuration services, NAT64 supports communication between IPv6 and IPv4 environments, and FTP is a file-transfer protocol. Therefore, Neighbor Discovery is the IPv6 mechanism that replaces ARP functionality.

Question: 376. Which type of route is manually configured by a network administrator rather than learned dynamically?

1. Connected route
   2. Dynamic route
   3. Static route
   4. Default gateway advertisement

Correct Answer: 3. Static route

Explanation:

A static route is manually configured by a network administrator to specify how traffic should reach a particular destination network or host. Static routes can be useful for simple topologies, specific paths, backup routes, or situations where dynamic routing is unnecessary. Dynamic routes are learned through routing protocols such as OSPF or RIP. Connected routes are automatically created for directly connected networks on many routers. Therefore, a manually configured route is known as a static route.

Question: 377. Which wireless security protocol provides stronger modern protection than WPA2 and is designed as its successor?

1. WEP
   2. WPA
   3. WPA3
   4. Open authentication

Correct Answer: 3. WPA3

Explanation:

WPA3 is a newer Wi-Fi security standard designed to provide stronger protections than earlier wireless security mechanisms. It improves authentication and security capabilities and introduces protections designed for modern wireless environments. WEP is obsolete and has significant security weaknesses, while WPA is an older security generation and WPA2 preceded WPA3. Wireless security should be configured according to device capabilities and organizational requirements. Among the listed choices, WPA3 represents the newer successor to WPA2.

Question: 378. What is the purpose of a loopback interface on a network device?

1. Provide a logical interface that is not tied to a physical port
   2. Replace every physical Ethernet interface
   3. Disable routing protocols
   4. Assign power to connected devices

Correct Answer: 1. Provide a logical interface that is not tied to a physical port

Explanation:

A loopback interface is a logical interface that is not directly associated with a specific physical network port. On routers and other Layer 3 devices, loopbacks can provide stable addresses for management, routing-protocol identification, monitoring, and other purposes. Because a loopback does not depend on one physical interface remaining operational, it can be more stable than using an individual physical port address. Loopback interfaces do not replace physical connectivity or provide electrical power to devices.

Question: 379. Which Ethernet frame field is used to identify the device that should receive the frame on the local Layer 2 network?

1. Source MAC address
   2. Destination MAC address
   3. Source port number
   4. TTL

Correct Answer: 2. Destination MAC address

Explanation:

The destination MAC address in an Ethernet frame identifies the Layer 2 destination for the frame. A switch examines this address to determine which port should receive the frame when the destination is known. The source MAC address identifies the sender and is used by switches for MAC learning. TCP or UDP port numbers identify transport-layer services, while TTL is an IPv4 field used to limit packet lifetime. Therefore, the destination MAC address is the Ethernet field used for local Layer 2 delivery.

Question: 380. Which troubleshooting approach is most appropriate when a device cannot communicate with any network destination?

1. Immediately replace every switch
   2. Change the DNS records first
   3. Verify physical connectivity, interface status, addressing, and gateway configuration systematically
   4. Disable all security controls permanently

Correct Answer: 3. Verify physical connectivity, interface status, addressing, and gateway configuration systematically

Explanation:

A systematic troubleshooting process begins with fundamental connectivity and progresses through the relevant network layers. Administrators should verify physical connections and interface status first, then check IP addressing, subnet configuration, default gateway settings, VLAN membership, routing, and applicable security policies. This approach helps isolate the actual fault without introducing unnecessary changes. Replacing equipment immediately or permanently disabling security controls is not an appropriate general troubleshooting method. DNS should be investigated when name resolution is specifically suspected rather than assumed to be the cause of every connectivity problem.