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Question: 261. Which protocol is used to securely transfer files over an SSH connection?

1. TFTP
   2. SFTP
   3. FTP
   4. HTTP

Correct Answer: 2. SFTP

Explanation:

SFTP, or SSH File Transfer Protocol, provides secure file transfer functionality through an SSH connection. It encrypts authentication credentials and transferred data, making it suitable for securely moving configuration files, software packages, and other files between systems. TFTP provides simple file transfer without the same security protections, FTP normally transmits credentials and data without encryption, and HTTP is primarily a web communication protocol. Therefore, SFTP is the appropriate protocol when secure file transfer over SSH is required.

Question: 262. Which device function allows a Layer 3 switch to route traffic between VLANs?

1. Inter-VLAN routing
   2. Port mirroring
   3. MAC learning
   4. Broadcast flooding

Correct Answer: 1. Inter-VLAN routing

Explanation:

Inter-VLAN routing allows devices in different VLANs to communicate through Layer 3 routing. A Layer 3 switch can create switched virtual interfaces, commonly called SVIs, for VLANs and use them as gateways for connected hosts. When a host needs to communicate with a different VLAN, the traffic is sent to its default gateway, where the Layer 3 switch routes it toward the destination VLAN. Port mirroring is used for traffic analysis, MAC learning supports Layer 2 forwarding, and broadcast flooding does not provide routing. Therefore, inter-VLAN routing is the correct function.

Question: 263. Which IPv4 address represents the loopback address commonly used to test the local TCP/IP stack?

1. 192.168.1.1
   2. 169.254.1.1
   3. 10.0.0.1
   4. 127.0.0.1

Correct Answer: 4. 127.0.0.1

Explanation:

The IPv4 address 127.0.0.1 is the commonly used loopback address for testing the local TCP/IP stack. Traffic sent to this address remains within the local host and does not need to travel through a physical network interface. Administrators can use loopback testing to determine whether the local IP networking stack is functioning independently of external network connectivity. The 192.168.0.0/16 and 10.0.0.0/8 ranges are private addresses, while 169.254.0.0/16 is used for IPv4 link-local addressing. Therefore, 127.0.0.1 is the correct loopback address.

Question: 264. What is the primary function of an access control list on a network device?

1. To increase physical link speed
   2. To synchronize network clocks
   3. To filter traffic according to defined criteria
   4. To assign hostnames automatically

Correct Answer: 3. To filter traffic according to defined criteria

Explanation:

An access control list, or ACL, contains rules that determine how traffic matching specified criteria should be handled. Depending on the platform, criteria can include source and destination IP addresses, protocols, ports, and interfaces. ACLs are commonly used to permit or deny traffic and enforce aspects of a network security policy. They do not increase physical link speed, synchronize clocks, or automatically assign hostnames. Because ACLs provide rule-based traffic filtering, they are an important tool for controlling network communication.

Question: 265. Which Ethernet standard is associated with 1 Gbps communication over twisted-pair copper?

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

Correct Answer: 1. 1000BASE-T 

Explanation:

1000BASE-T is the Ethernet standard commonly associated with 1 Gbps transmission over twisted-pair copper cabling. It uses four pairs of copper conductors and is widely deployed in enterprise access networks. 100BASE-TX supports 100 Mbps over copper, while 10BASE-T supports 10 Mbps. 1000BASE-SX also supports Gigabit Ethernet but uses multimode fiber rather than twisted-pair copper. Therefore, 1000BASE-T is the appropriate standard when identifying Gigabit Ethernet over copper.

Question: 266. What is the purpose of an SVI on a Layer 3 switch?

1. To provide a logical Layer 3 interface associated with a VLAN
   2. To physically connect two fiber cables
   3. To encrypt wireless traffic
   4. To replace all physical switch ports

Correct Answer: 1. To provide a logical Layer 3 interface associated with a VLAN

Explanation:

A Switched Virtual Interface, or SVI, is a logical interface associated with a VLAN on a switch. On a Layer 3 switch, an SVI can have an IP address and serve as the default gateway for devices within that VLAN. SVIs are therefore commonly used to enable inter-VLAN routing and provide management connectivity. An SVI is not a physical cable connection and does not encrypt wireless traffic. It also does not replace physical switch ports. Its key role is providing a logical Layer 3 interface for a VLAN.

Question: 267. Which protocol is commonly used to automatically discover the default gateway and other IPv6 network information?

1. FTP
   2. ICMPv6 Neighbor Discovery
   3. SMTP
   4. ARP

Correct Answer: 2. ICMPv6 Neighbor Discovery

Explanation:

IPv6 hosts use Neighbor Discovery mechanisms carried through ICMPv6 to discover routers and obtain important network information. Router Solicitation and Router Advertisement messages allow hosts to learn about available routers and prefixes and can support Stateless Address Autoconfiguration. IPv6 does not use ARP for these functions. FTP is used for file transfer, while SMTP is associated with email transport. Therefore, ICMPv6 Neighbor Discovery is the appropriate mechanism for discovering IPv6 routers and related network information.

Question: 268. Which type of Ethernet cable was traditionally used to connect similar devices directly when automatic crossover was unavailable?

1. Rollover cable
   2. Console cable
   3. Crossover cable
   4. Fiber patch cable

Correct Answer: 3. Crossover cable

Explanation:

A crossover cable was traditionally used to directly connect similar Ethernet devices, such as switch-to-switch or computer-to-computer connections, when the interfaces did not automatically adjust their transmit and receive pairs. Modern equipment often supports Auto-MDI/MDIX, which can automatically detect and compensate for the required pair arrangement, reducing the need for crossover cables. Rollover and console cables are used for device management connections, while fiber patch cables use optical transmission. Therefore, a crossover cable is the traditional answer for direct connections between similar Ethernet devices.

Question: 269. What does duplex mismatch typically cause on an Ethernet link?

1. Improved throughput
   2. Packet loss and performance problems
   3. Automatic VLAN creation
   4. Faster DNS resolution

Correct Answer: 2. Packet loss and performance problems

Explanation:

A duplex mismatch occurs when connected Ethernet interfaces operate with different duplex settings. For example, one side may operate in full-duplex while the other operates in half-duplex. This can cause collisions, late collisions, retransmissions, errors, and significantly reduced performance. Symptoms may include poor throughput and packet loss even though the physical link appears to be operational. Duplex mismatch does not create VLANs or improve DNS resolution. Therefore, packet loss and performance degradation are common symptoms of a duplex mismatch.

Question: 270. Which technology allows multiple devices to share one public IPv4 address by using different transport-layer port numbers?

1. VLAN
   2. STP
   3. PAT
   4. LLDP

Correct Answer: 3. PAT

Explanation:

Port Address Translation, or PAT, is a form of NAT that allows multiple internal devices to share a single public IPv4 address. The translation process uses different TCP or UDP source port numbers to keep individual connections separate. This technique is widely used in IPv4 networks because public IPv4 addresses are limited. VLANs separate Layer 2 broadcast domains, STP prevents switching loops, and LLDP provides neighbor discovery. Therefore, PAT is the technology that commonly allows many internal devices to share one public IPv4 address.

Question: 271. Which wireless technology allows a client device to move between access points while maintaining network connectivity?

1. Wireless roaming
   2. NAT
   3. Port security
   4. DHCP snooping

Correct Answer: 1. Wireless roaming

Explanation:

Wireless roaming allows a client device to move from one access point to another while maintaining connectivity to the wireless network. Proper wireless design, consistent security settings, and appropriate access-point configuration help clients transition between access points efficiently. Roaming is especially important in environments such as offices, warehouses, hospitals, and campuses where users move through areas covered by multiple access points. NAT translates IP addresses, port security controls switch-port access, and DHCP snooping protects DHCP operations. Therefore, wireless roaming is the correct technology.

Question: 272. What is the main purpose of a network monitoring system?

1. To replace every network switch
   2. To assign MAC addresses manually
   3. To monitor device health, performance, and availability
   4. To eliminate the need for network documentation

Correct Answer: 3. To monitor device health, performance, and availability

Explanation:

A network monitoring system collects and analyzes information about network devices, links, services, and performance. It can track metrics such as interface utilization, errors, latency, device availability, CPU usage, and memory consumption. Monitoring systems can also generate alerts when defined thresholds or failure conditions occur, helping administrators identify problems before or as they affect users. Monitoring does not replace switches, manually assign MAC addresses, or eliminate the value of documentation. Therefore, monitoring device health, performance, and availability is its primary purpose.

Question: 273. Which routing table entry is generally used when no more specific route matches a destination?

1. Host route
   2. Default route
   3. Connected route
   4. Loopback route

Correct Answer: 2. Default route

Explanation:

A default route provides a fallback path for traffic when the routing table does not contain a more specific route for the destination. In IPv4, it is commonly represented as 0.0.0.0/0, while the IPv6 equivalent is ::/0. A router forwards traffic according to the most specific matching route, and the default route is used when no better match exists. Connected and host routes describe more specific destinations, while a loopback route refers to a local logical interface. Therefore, the default route serves as the general fallback path.

Question: 274. Which network service translates human-readable domain names into IP addresses?

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

Correct Answer: 2. DNS

Explanation:

The Domain Name System, or DNS, translates human-readable domain names into IP addresses and supports other forms of name-related information. For example, DNS can allow a user to access a service using a domain name instead of manually entering its numerical IP address. DHCP provides network configuration, NTP synchronizes time, and SNMP supports monitoring and management. DNS is therefore a fundamental service for locating network resources by name and is used extensively across enterprise and Internet environments.

Question: 275. What is the primary benefit of full-duplex Ethernet?

1. It allows simultaneous transmission and reception without traditional collisions
   2. It requires every frame to be broadcast
   3. It disables MAC address learning
   4. It forces all ports into half-duplex operation

Correct Answer: 1. It allows simultaneous transmission and reception without traditional collisions

Explanation:

Full-duplex Ethernet allows a device to transmit and receive simultaneously on a link. Because each direction has a dedicated communication path, traditional Ethernet collisions associated with shared half-duplex operation do not occur on a properly configured full-duplex link. Full-duplex operation can therefore improve efficiency and throughput. It does not require frames to be broadcast, disable MAC learning, or force ports into half-duplex mode. Therefore, simultaneous transmission and reception without traditional collisions is the primary benefit.

Question: 276. Which IPv6 address type is used to deliver traffic to multiple receivers that have joined a group?

1. Multicast
   2. Unicast
   3. Anycast
   4. Loopback

Correct Answer: 1. Multicast

Explanation:

IPv6 multicast addresses identify groups of interfaces, allowing traffic to be delivered to multiple receivers that have joined the corresponding multicast group. IPv6 relies heavily on multicast for functions that might otherwise use broadcast in IPv4. Unicast identifies an individual interface, while anycast identifies multiple interfaces but delivers traffic to the nearest appropriate member. The IPv6 loopback address identifies the local host. Therefore, multicast is the correct addressing type for one-to-many group communication.

Question: 277. Which command or utility is commonly used to display the path packets take toward a remote destination?

1. ping
   2. traceroute
   3. arp
   4. hostname

Correct Answer: 2. traceroute

Explanation:

Traceroute, known as tracert on many Windows systems, is used to identify the sequence of Layer 3 hops between a source device and a destination. It can help administrators determine where delays, routing problems, or connectivity failures occur along a path. Ping primarily tests reachability and response time, while ARP provides local IPv4-to-MAC address resolution information. The hostname utility is related to displaying or configuring the local system’s hostname. Therefore, traceroute is the appropriate diagnostic utility for examining the path toward a destination.

Question: 278. What is the main purpose of DHCP relay functionality?

1. To allow DHCP requests to cross Layer 3 boundaries
   2. To encrypt all DHCP messages
   3. To replace the DHCP server database
   4. To convert IPv4 addresses into MAC addresses

Correct Answer: 1. To allow DHCP requests to cross Layer 3 boundaries

Explanation:

DHCP clients initially use broadcasts that normally remain within their local broadcast domain. A DHCP relay agent forwards DHCP requests between the client network and a DHCP server located on another IP subnet. This allows organizations to centralize DHCP services while supporting clients across multiple routed networks. DHCP relay does not encrypt all DHCP messages, replace the DHCP server database, or perform IPv4-to-MAC resolution. Therefore, allowing DHCP communication to cross Layer 3 boundaries is the primary purpose of DHCP relay functionality.

Question: 279. Which metric is most directly associated with the amount of data successfully transferred per unit of time?

1. Latency
   2. Jitter
   3. Throughput
   4. Packet loss

Correct Answer: 3. Throughput

Explanation:

Throughput represents the amount of data successfully transferred over a network connection during a given period, commonly expressed in bits per second. It can be affected by congestion, protocol overhead, packet loss, link capacity, and other network conditions. Latency measures the time required for traffic to travel between endpoints, jitter measures variation in packet arrival time, and packet loss measures traffic that fails to reach its destination. Therefore, throughput is the metric most directly associated with the amount of successfully transferred data over time.

Question: 280. Which security mechanism can help prevent unauthorized DHCP servers from responding to clients on a managed switch?

1. DHCP snooping
   2. STP
   3. NTP
   4. NAT

Correct Answer: 1. DHCP snooping

Explanation:

DHCP snooping is a Layer 2 security feature designed to help protect DHCP operations. It allows a switch to distinguish between trusted and untrusted ports and can prevent DHCP server responses from unauthorized devices connected to untrusted ports. DHCP snooping can also build a binding database containing information such as IP addresses, MAC addresses, VLANs, and switch ports, depending on the implementation. STP prevents Layer 2 loops, NTP provides time synchronization, and NAT translates addresses. Therefore, DHCP snooping is the appropriate security mechanism.