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Question: 61. Which protocol is commonly used to discover neighboring network devices and their capabilities?

1. CDP
   2. SMTP
   3. DHCP
   4. FTP

Correct Answer: 1

Explanation: Cisco Discovery Protocol (CDP) is a Layer 2 discovery protocol that can provide information about directly connected Cisco devices. It may reveal details such as the neighboring device name, platform, capabilities, and connected interface. This information can be valuable during network documentation and troubleshooting. DHCP is used for automatic IP configuration, SMTP is associated with email transmission, and FTP is used for file transfers. CDP is vendor-specific, while similar discovery functionality can be provided by standards-based protocols such as LLDP. Administrators can use neighbor-discovery information to verify physical connections and understand network topology.

Question: 62. Which standards-based protocol provides device discovery information between network devices from different vendors?

1. STP
   2. LLDP
   3. NAT
   4. ARP

Correct Answer: 2

Explanation: LLDP (Link Layer Discovery Protocol) is a standards-based Layer 2 protocol designed to allow network devices to advertise information about themselves to directly connected neighbors. It can help administrators identify connected devices, interfaces, system names, and capabilities. Unlike vendor-specific discovery protocols, LLDP is designed for interoperability between equipment from different manufacturers. STP is used to prevent Layer 2 loops, NAT translates addresses, and ARP resolves IPv4 addresses to MAC addresses. LLDP is particularly useful in multi-vendor enterprise environments where consistent network-discovery information is needed for documentation and troubleshooting.

Question: 63. What is the primary purpose of a trunk link between network switches?

1. Carry traffic for multiple VLANs
   2. Assign IP addresses to clients
   3. Provide DNS resolution
   4. Encrypt all network traffic

Correct Answer: 1

Explanation: A trunk link is designed to carry traffic belonging to multiple VLANs across a single physical connection. VLAN identification is maintained using a tagging mechanism such as IEEE 802.1Q. Trunks are commonly used between switches, between switches and routers, or between switches and other VLAN-aware devices. A trunk does not primarily assign IP addresses, provide DNS services, or automatically encrypt traffic. Proper trunk configuration requires both ends to agree on the VLANs and tagging behavior. Incorrect trunk settings can result in VLAN connectivity problems or unexpected traffic behavior.

Question: 64. Which IPv4 address range is reserved for link-local addressing when a device cannot obtain an address through normal configuration methods?

1. 10.0.0.0/8
   2. 127.0.0.0/8
   3. 169.254.0.0/16
   4. 224.0.0.0/4

Correct Answer: 3

Explanation: The IPv4 range 169.254.0.0/16 is reserved for link-local addressing. A device may automatically assign itself an address from this range when it cannot obtain a suitable IPv4 address through mechanisms such as DHCP. Link-local addresses are intended for communication on the local network segment and are not normally routed between networks. The 10.0.0.0/8 range is a private IPv4 range, 127.0.0.0/8 is reserved for loopback, and 224.0.0.0/4 is associated with IPv4 multicast. Recognizing these address ranges is useful during network troubleshooting and configuration analysis.

Question: 65. Which protocol is commonly used to provide secure web communication?

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

Correct Answer: 2

Explanation: HTTPS provides secure web communication by using HTTP over a protected TLS connection. TLS helps provide encryption, integrity, and authentication for communication between a client and a web server. This protects sensitive information such as login credentials and other data from being transmitted as plain text across the network. HTTP by itself does not provide the same transport-level encryption. TFTP is a lightweight file-transfer protocol, while Telnet provides remote terminal access without modern encryption. HTTPS is therefore widely used for websites, administrative interfaces, APIs, and other web-based services that require protected communication.

Question: 66. What is the primary purpose of a network management system (NMS)?

1. Replace all network switches
   2. Monitor and manage network infrastructure
   3. Provide electrical power to devices
   4. Convert IPv4 to IPv6 automatically

Correct Answer: 2

Explanation: A Network Management System (NMS) provides centralized visibility and management capabilities for network infrastructure. Depending on the platform, an NMS can monitor device availability, interface utilization, errors, alerts, performance metrics, configuration information, and other operational data. It can help administrators identify problems and maintain awareness of network health. An NMS does not replace network switches, supply electrical power, or automatically perform all IPv4-to-IPv6 conversion. Instead, it works with network devices and management protocols to provide centralized operational information and, in some environments, configuration-management capabilities.

Question: 67. Which wireless frequency band is commonly associated with modern Wi-Fi networks?

1. 2.4 GHz
   2. 60 Hz
   3. 100 MHz
   4. 400 MHz

Correct Answer: 1

Explanation: The 2.4 GHz frequency band is widely used by Wi-Fi networks and supports many common wireless devices. It can provide good coverage because signals at this frequency generally travel through obstacles better than higher-frequency signals, although it is also more susceptible to congestion and interference from other devices. Modern Wi-Fi technologies can also operate in 5 GHz and, depending on the standard and equipment, 6 GHz bands. The listed alternatives such as 60 Hz and 100 MHz are not typical Wi-Fi operating bands. Wireless planning should consider coverage, interference, channel availability, and client capabilities.

Question: 68. What is the main purpose of a wireless controller in an enterprise WLAN?

1. Manage and coordinate multiple wireless access points
   2. Replace every Ethernet switch
   3. Act as a public DNS server
   4. Convert MAC addresses into domain names

Correct Answer: 1

Explanation: A wireless LAN controller can centrally manage and coordinate multiple wireless access points. Depending on the platform, it can provide centralized configuration, security settings, firmware management, radio-frequency management, client visibility, and other operational functions. Centralized management can simplify administration in larger wireless deployments because administrators do not need to configure every access point independently. A wireless controller does not replace all Ethernet switches, act as a public DNS server, or convert MAC addresses into domain names. Its primary purpose is to improve the centralized management and operation of enterprise wireless infrastructure.

Question: 69. Which type of cable uses light rather than electrical signals to transmit data?

1. Coaxial cable
   2. Twisted-pair copper
   3. Fiber-optic cable
   4. Console cable

Correct Answer: 3

Explanation: Fiber-optic cable transmits data using light signals rather than electrical signals. This provides several advantages, including high bandwidth, long transmission distances, and strong resistance to electromagnetic interference. Fiber can be used in backbone connections, data centers, enterprise networks, and long-distance communication links. Twisted-pair copper uses electrical signaling, coaxial cable also uses electrical signaling, and console cables are generally used for device management. Fiber installations require appropriate transceivers, connectors, and optical components, and administrators must consider factors such as fiber type, distance, and supported optical standards when designing a network.

Question: 70. Which characteristic is generally associated with full-duplex Ethernet communication?

1. Devices can transmit and receive simultaneously
   2. Only one device can transmit at a time
   3. All frames are broadcast
   4. Collisions are required for communication

Correct Answer: 1

Explanation: Full-duplex Ethernet allows a device to transmit and receive data simultaneously over a network connection. Because both directions can operate at the same time, full-duplex communication does not require the traditional collision-detection behavior associated with half-duplex Ethernet. Modern switched Ethernet networks commonly use full-duplex links. Half-duplex communication permits transmission in only one direction at a time and historically required mechanisms to manage collisions on shared Ethernet media. Understanding duplex settings can be useful when diagnosing performance problems, interface errors, or unexpected negotiation behavior between connected network devices.

Question: 71. Which security technology can encrypt IP traffic between two network endpoints?

1. VLAN
   2. IPsec
   3. DHCP
   4. ARP

Correct Answer: 2

Explanation: IPsec is a collection of protocols and mechanisms designed to secure IP communications. It can provide encryption, integrity protection, authentication, and other security functions depending on the configuration. IPsec is commonly used in VPN implementations to protect traffic between endpoints or network gateways across untrusted networks. VLANs provide logical network segmentation, DHCP provides network configuration, and ARP resolves IPv4 addresses to MAC addresses on local networks. IPsec therefore addresses the security of IP communications rather than basic addressing or Layer 2 segmentation. Correct configuration is important because incompatible security parameters can prevent successful communication.

Question: 72. What does packet loss indicate in a network?

1. Some packets fail to reach their intended destination
   2. Every packet is encrypted
   3. The network has unlimited bandwidth
   4. All routing tables are synchronized

Correct Answer: 1

Explanation: Packet loss occurs when some packets transmitted across a network fail to reach their intended destination. It can result from congestion, faulty links, interface problems, overloaded equipment, wireless interference, routing issues, or other network conditions. Packet loss can negatively affect applications, especially real-time voice and video services. It is different from latency, which measures delay, and jitter, which measures variation in delay. Network administrators can use monitoring and troubleshooting tools to identify where packet loss occurs and determine whether the problem is associated with a particular interface, link, device, or network path.

Question: 73. Which routing concept determines the preferred route when multiple routes exist to the same destination?

1. Route selection
   2. DNS resolution
   3. MAC learning
   4. Port mirroring

Correct Answer: 1

Explanation: Route selection is the process by which a router determines which available route should be used to reach a destination. Routing decisions can consider factors such as prefix length, administrative distance, protocol-specific metrics, and other routing information depending on the platform and protocol. A router generally prefers the most specific matching destination prefix before considering other route-selection criteria. DNS resolution converts names into addresses, MAC learning is primarily a Layer 2 switch function, and port mirroring copies traffic for monitoring. Understanding route selection is important when troubleshooting unexpected forwarding paths.

Question: 74. What is the primary function of a VPN gateway?

1. Provide encrypted connectivity between networks or users
   2. Replace all DNS servers
   3. Increase Ethernet cable length
   4. Assign MAC addresses to switches

Correct Answer: 1

Explanation: A VPN gateway establishes and manages secure VPN connections between users, networks, or network security domains. Depending on the VPN technology, it can authenticate endpoints, negotiate security parameters, encrypt traffic, and manage tunnels. VPN gateways are commonly deployed for remote-access connectivity and site-to-site connections. They do not replace DNS servers, extend Ethernet cable length, or assign MAC addresses. A properly configured VPN gateway can allow authorized users or remote networks to communicate securely across an untrusted infrastructure such as the public Internet while enforcing defined authentication and security policies.

Question: 75. Which protocol is associated with directory services and centralized access to directory information?

1. LDAP
   2. ICMP
   3. RTP
   4. NTP

Correct Answer: 1

Explanation: LDAP (Lightweight Directory Access Protocol) is used to access and manage directory information. Directory services can store information about users, groups, computers, organizational units, and other resources. LDAP is commonly associated with centralized identity and directory systems and can support applications that need to query or authenticate against directory information. ICMP is used for network control and diagnostics, RTP is associated with real-time media transport, and NTP provides time synchronization. Understanding LDAP is useful when working with enterprise authentication and directory infrastructures where centralized identity information must be accessed by multiple systems.

Question: 76. Which metric describes variation in packet delay over time?

1. Bandwidth
   2. Jitter
   3. Throughput
   4. Address space

Correct Answer: 2

Explanation: Jitter describes variation in packet delay over time. It is particularly important for real-time applications such as voice and video because inconsistent packet arrival can affect playback quality and communication stability. A network may have acceptable average latency while still experiencing significant jitter. Bandwidth describes theoretical or available data-carrying capacity, throughput measures actual successful data transfer, and address space refers to the range of available network addresses. QoS mechanisms can sometimes be used to help manage traffic conditions that contribute to delay variation, although overall network design and capacity also influence jitter.

Question: 77. What is the purpose of a network baseline?

1. Establish a reference for normal network performance
   2. Disable all monitoring tools
   3. Replace network addressing
   4. Prevent users from accessing the network

Correct Answer: 1

Explanation: A network baseline documents typical or normal operating conditions for a network. It can include measurements such as bandwidth utilization, latency, interface errors, CPU usage, memory utilization, and traffic patterns. When a problem occurs, administrators can compare current measurements with the baseline to identify unusual behavior. A baseline does not replace addressing, disable monitoring, or prevent users from accessing the network. Establishing an accurate baseline requires collecting measurements over an appropriate period so that normal variations, peak usage periods, and recurring traffic patterns are represented.

Question: 78. Which technology can provide authentication before allowing a device to access a wired or wireless network?

1. 802.1X
   2. NAT
   3. STP
   4. DNS

Correct Answer: 1

Explanation: IEEE 802.1X provides port-based network access control and can require authentication before a device receives authorized network access. It is commonly used with wired Ethernet and wireless networks and can integrate with an authentication server such as a RADIUS server. This approach allows organizations to apply identity-based access policies rather than automatically trusting every device that connects to a network port. NAT performs address translation, STP prevents Layer 2 loops, and DNS provides name resolution. 802.1X can therefore play an important role in enterprise access-control and network security architectures.

Question: 79. What is the primary benefit of using a hierarchical network design?

1. It eliminates the need for network documentation
   2. It provides structured scalability and easier management
   3. It prevents all network outages
   4. It removes the need for routing

Correct Answer: 2

Explanation: A hierarchical network design organizes infrastructure into structured layers or functional areas. Traditional enterprise designs may use access, distribution, and core layers, although modern architectures can use different models depending on requirements. A structured design can improve scalability, simplify management, make troubleshooting easier, and allow network policies to be applied consistently. It does not guarantee that outages will never occur and does not eliminate routing or documentation requirements. The exact architecture should reflect organizational needs, traffic patterns, resiliency requirements, security policies, and technology choices. Proper hierarchy can make complex networks easier to operate and expand.

Question: 80. Which command is commonly used to display the IP configuration of a Windows computer?

1. ipconfig
   2. chmod
   3. grep
   4. traceroute

Correct Answer: 1

Explanation: The ipconfig command is commonly used on Windows systems to display IP configuration information. Depending on the options used, it can show addresses, subnet masks, default gateways, and other network-related information, and it can also perform certain DHCP-related operations. Commands such as chmod and grep are commonly associated with Unix-like operating systems and have different purposes. Traceroute or tracert is used to examine the path toward a destination rather than simply displaying local IP configuration. During troubleshooting, ipconfig is often one of the first commands used to verify whether a Windows host has appropriate network settings.