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Question: 281. Which protocol provides encrypted web communication between a client and a web server?

1. HTTP
   2. HTTPS
   3. TFTP
   4. Telnet

Correct Answer: 2. HTTPS

Explanation:

HTTPS uses HTTP over a secure TLS connection to protect communication between a client and a web server. TLS provides encryption and helps authenticate the server, reducing the risk of attackers intercepting or modifying sensitive information during transmission. HTTP by itself does not provide transport encryption. TFTP is a simple file-transfer protocol, while Telnet provides remote terminal access without modern transport encryption. HTTPS is therefore the appropriate protocol when secure web communication is required.

Question: 282. What is the main function of a router in an IP network?

1. Forward packets between different networks
   2. Learn only Ethernet MAC addresses
   3. Provide electrical power to endpoints
   4. Convert domain names into IP addresses

Correct Answer: 1. Forward packets between different networks

Explanation:

A router connects different IP networks and makes forwarding decisions based on destination addresses and its routing information. When a packet arrives, the router examines the destination IP address and determines the appropriate next hop or outgoing interface. Switches primarily perform Layer 2 forwarding based on MAC addresses, PoE equipment can provide power, and DNS performs name resolution. Therefore, forwarding packets between different networks is a core function of a router.

Question: 283. Which VLAN type is commonly used to carry traffic from an end-user device connected to a switch port?

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

Correct Answer: 4. Access VLAN

Explanation:

An access VLAN is assigned to a switch access port and normally carries traffic for a single VLAN. End-user devices such as computers and printers are commonly connected through access ports. A trunk port can carry multiple VLANs, while a management VLAN is used for device management traffic and a voice VLAN can be configured specifically for IP telephony. Therefore, an access VLAN is the typical VLAN type associated with an ordinary end-user device connected to an access port.

Question: 284. Which IPv4 address is part of the private 172.16.0.0/12 address range?

1. 172.32.10.5
   2. 172.15.10.5
   3. 172.20.10.5
   4. 172.64.10.5

Correct Answer: 3. 172.20.10.5

Explanation:

The private IPv4 range 172.16.0.0/12 extends from 172.16.0.0 through 172.31.255.255. Therefore, 172.20.10.5 falls within the private range and can be used for internal network addressing. The addresses 172.15.10.5, 172.32.10.5, and 172.64.10.5 fall outside this specific private block. Private addresses are commonly used inside organizations and are generally translated when communicating with public Internet destinations. Thus, 172.20.10.5 is the correct answer.

Question: 285. What does a network interface’s link status primarily indicate?

1. Whether a physical or logical connection is established
   2. Whether DNS is functioning correctly
   3. Whether every remote destination is reachable
   4. Whether the device has sufficient storage capacity

Correct Answer: 1. Whether a physical or logical connection is established

Explanation:

Link status provides information about whether a network interface has an active connection. On an Ethernet interface, this can indicate that the physical layer has detected a usable connection to another device. A link being up does not guarantee that DNS, routing, or applications are functioning correctly. For example, an interface may show an active link while having an incorrect IP configuration. Therefore, link status primarily indicates whether the network connection at the interface level is established.

Question: 286. Which protocol is commonly used to securely authenticate and manage a network device remotely through a CLI?

1. Telnet
   2. SSH
   3. HTTP
   4. SNMP

Correct Answer: 2. SSH 

Explanation:

SSH provides encrypted remote command-line access to network devices and servers. It protects authentication credentials and interactive session data from being transmitted in clear text. Network administrators commonly use SSH to configure routers, switches, firewalls, and servers remotely. Telnet also supports remote CLI access but lacks comparable transport encryption. HTTP is primarily used for web-based management, while SNMP is generally used for monitoring and management information exchange rather than interactive CLI administration. Therefore, SSH is the appropriate protocol for secure remote CLI access.

Question: 287. Which type of route is automatically installed when a router interface is configured with an IP address and becomes operational?

1. Static route
   2. Default route
   3. Connected route
   4. Floating route

Correct Answer: 3. Connected route

Explanation:

When a router interface is configured with an IP address and becomes operational, the router normally installs a connected route for the directly attached network. This route tells the router that destinations within that subnet can be reached through the associated interface. Static routes must be manually configured, a default route provides a fallback path, and floating routes are commonly configured as backup paths with higher administrative distance. Therefore, the automatically learned route for a directly attached network is a connected route.

Question: 288. Which technology is used to prevent unauthorized devices from connecting through a wireless network?

1. WPA3 authentication
   2. NTP
   3. STP
   4. NAT

Correct Answer: 1. WPA3 authentication

Explanation:

WPA3 provides modern wireless security mechanisms that help authenticate clients and protect wireless communications. WPA3-Personal uses SAE for authentication, providing stronger protection than older wireless security methods. Proper authentication ensures that only authorized users who meet the configured security requirements can access the protected wireless network. NTP synchronizes time, STP prevents Layer 2 loops, and NAT translates network addresses. Therefore, WPA3 authentication is the technology among the listed options directly associated with securing wireless network access.

Question: 289. What is the primary purpose of a network topology diagram?

1. To assign passwords automatically
   2. To show network devices and their interconnections
   3. To replace device configuration files
   4. To calculate Internet bandwidth automatically

Correct Answer: 2. To show network devices and their interconnections

Explanation:

A network topology diagram provides a visual representation of network devices, links, and their relationships. It can show switches, routers, firewalls, servers, access points, and connections between them. Such diagrams are valuable for troubleshooting, planning changes, documenting infrastructure, and understanding traffic paths. A topology diagram does not automatically assign passwords, replace device configurations, or calculate Internet bandwidth. Therefore, representing network devices and their interconnections is its primary purpose.

Question: 290. Which protocol is responsible for exchanging routing information between autonomous systems on the Internet?

1. OSPF
   2. RIP
   3. BGP
   4. ARP

Correct Answer: 3. BGP

Explanation:

Border Gateway Protocol, or BGP, is the principal routing protocol used to exchange reachability information between autonomous systems. It plays a central role in Internet routing and allows independently administered networks to exchange information about reachable IP prefixes. OSPF and RIP are generally used as interior routing protocols within individual routing domains, while ARP performs local IPv4 address-to-MAC resolution. BGP therefore provides the inter-autonomous-system routing function required for large-scale Internet connectivity.

Question: 291. Which wireless band is commonly more susceptible to interference from devices such as Bluetooth equipment and microwave ovens?

1. 2.4 GHz
   2. 5 GHz
   3. 6 GHz
   4. 60 GHz

Correct Answer: 1. 2.4 GHz

Explanation:

The 2.4 GHz wireless band is commonly subject to interference from various consumer and industrial devices, including Bluetooth equipment and microwave ovens. It also has fewer non-overlapping Wi-Fi channels than higher-frequency Wi-Fi bands in many regulatory environments. The 5 GHz and 6 GHz bands generally offer more spectrum for Wi-Fi operation, although they have their own propagation and regulatory considerations. Therefore, 2.4 GHz is the band most commonly associated with the interference sources described.

Question: 292. What is the purpose of a default VLAN on a switch?

1. To provide automatic Internet access
   2. To identify DNS servers
   3. To serve as the initial VLAN assignment for certain switch ports
   4. To replace all routed interfaces

Correct Answer: 3. To serve as the initial VLAN assignment for certain switch ports 

Explanation:

A switch commonly has a default VLAN to which access ports may initially belong before an administrator assigns them to other VLANs. The exact default VLAN and its behavior depend on the switch platform and configuration. VLAN assignment determines the Layer 2 broadcast domain associated with a port. A default VLAN does not automatically provide Internet access, identify DNS servers, or replace routed interfaces. Therefore, serving as an initial VLAN assignment for certain ports is the appropriate description.

Question: 293. Which command is commonly used to verify the IP configuration of a Windows workstation?

1. ipconfig
   2. traceroute
   3. nslookup
   4. arp

Correct Answer: 1. Ipconfig

Explanation:

The Windows ipconfig utility displays IP configuration information for network interfaces. Depending on the options used, it can show IPv4 and IPv6 addresses, subnet masks, default gateways, DNS-related information, and DHCP status. Traceroute or tracert is used to examine network paths, nslookup performs DNS queries, and arp displays ARP-related information. Therefore, ipconfig is the standard command for checking a Windows workstation’s IP configuration.

Question: 294. What does the term “latency” describe in network communication?

1. The total number of VLANs
   2. The time required for data to travel between endpoints
   3. The maximum Ethernet frame size
   4. The number of available MAC addresses

Correct Answer: 2. The time required for data to travel between endpoints

Explanation:

Network latency represents the time associated with transmitting data between endpoints. It can be influenced by propagation distance, processing, queuing, and transmission delays. High latency can negatively affect interactive applications such as voice communication, video conferencing, remote desktops, and online services. MTU describes maximum packet size, while VLAN and MAC address counts represent different network characteristics. Therefore, the time required for data to travel between endpoints is the correct description of latency.

Question: 295. Which feature can automatically provide power to compatible Ethernet-connected devices such as access points and IP phones?

1. QoS
   2. PoE
   3. NAT
   4. STP

Correct Answer: 2. PoE

Explanation:

Power over Ethernet, or PoE, allows compatible network devices to receive electrical power through Ethernet cabling while also carrying network traffic. It is commonly used with devices such as wireless access points, IP phones, and certain security cameras. PoE can simplify installation because a separate electrical power cable may not be required at the endpoint location. QoS manages traffic, NAT translates addresses, and STP prevents switching loops. Therefore, PoE is the technology designed to provide power through Ethernet connections.

Question: 296. Which type of IP address is intended to identify one specific interface?

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

Correct Answer: 4. Unicast 

Explanation:

A unicast IP address identifies a specific network interface and is used for one-to-one communication. Traffic sent to a unicast destination is intended for that particular interface. Multicast addresses identify groups of receivers, while broadcast is a one-to-all mechanism in IPv4 within the applicable broadcast domain. Anycast addresses can be assigned to multiple interfaces but direct traffic toward the nearest appropriate instance. Therefore, unicast is the address type used to identify one specific interface.

Question: 297. Which security control can limit the number of MAC addresses learned on a switch port?

1. Port security
   2. DNS
   3. NTP
   4. DHCP relay

Correct Answer: 1. Port security

Explanation:

Port security can limit which MAC addresses are allowed on a switch port and, depending on the platform, can restrict the number of dynamically learned addresses. This can help prevent unauthorized devices from using a particular access port. Administrators can configure actions for violations, such as dropping unauthorized frames or disabling the affected port. DNS provides name resolution, NTP synchronizes time, and DHCP relay forwards DHCP messages across routed boundaries. Therefore, port security is the appropriate control for limiting MAC addresses on a switch port.

Question: 298. Which routing characteristic determines how trustworthy a route source is compared with another route source on many network devices?

1. MTU
   2. Administrative distance
   3. VLAN ID
   4. MAC aging timer

Correct Answer: 2. Administrative distance

Explanation:

Administrative distance is used on many routing platforms to compare the relative trustworthiness of routes learned from different routing sources. When multiple routing protocols provide routes to the same destination, the route with the more preferred administrative distance may be selected. Administrative distance is distinct from metrics used within a particular routing protocol. MTU controls packet size, VLAN IDs identify VLANs, and MAC aging timers affect Layer 2 address-table entries. Therefore, administrative distance is the relevant characteristic for comparing route sources.

Question: 299. What is the primary purpose of a network access control policy?

1. To define who or what is permitted to access network resources
   2. To increase cable transmission distance
   3. To replace routing protocols
   4. To eliminate all network segmentation

Correct Answer: 1. To define who or what is permitted to access network resources

Explanation:

A network access control policy establishes rules governing which users, devices, or systems may access network resources. Depending on the environment, policies can consider identity, device state, authentication, location, network segment, and other security attributes. The objective is to ensure that access is granted according to defined organizational requirements. Such policies do not increase cable distance or replace routing protocols, and they can actually support network segmentation. Therefore, defining permitted access to network resources is the primary purpose.

Question: 300. Which protocol is commonly used to obtain an IPv6 address and other configuration information automatically from a DHCPv6 server?

1. DHCPv6
   2. FTP
   3. SNMP
   4. SMTP

Correct Answer: 1. DHCPv6

 Explanation:

DHCPv6 is designed to provide IPv6 configuration information to clients. Depending on the deployment, it can provide IPv6 addresses and other configuration parameters such as DNS-related information. IPv6 networks may also use Stateless Address Autoconfiguration, where hosts configure addresses based on information received through Router Advertisements. FTP is used for file transfer, SNMP for network management, and SMTP for email transport. Therefore, DHCPv6 is the protocol specifically designed to provide IPv6 configuration information from a DHCPv6 server.