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Question: 201. Which Aruba networking feature can help prioritize certain types of traffic during periods of congestion?

1. DNS
   2. Quality of Service
   3. ARP
   4. LLDP

Correct Answer: 2

Explanation: Quality of Service (QoS) provides mechanisms for identifying, classifying, and prioritizing network traffic so that important applications can receive appropriate treatment during congestion. Depending on the configuration, traffic can be classified according to attributes such as application, protocol, port, address, or markings. QoS is particularly useful for latency-sensitive or bandwidth-sensitive applications such as voice and video. DNS provides name resolution, ARP maps IPv4 addresses to MAC addresses, and LLDP discovers neighboring devices. QoS therefore helps administrators manage network resources and provide differentiated treatment to traffic according to defined policies.

Question: 202. What does PoE allow a compatible Ethernet switch to provide over an Ethernet cable?

1. Only DNS information
   2. Only VLAN tags
   3. Power to compatible powered devices
   4. A separate fiber connection

Correct Answer: 3

Explanation: Power over Ethernet (PoE) allows a compatible Ethernet switch to deliver electrical power to supported powered devices over the Ethernet cable used for network connectivity. Common PoE-powered devices include wireless access points, IP phones, and certain security cameras. This can simplify installations because a separate electrical power connection may not be required at the device location. PoE does not replace VLAN tagging, DNS services, or fiber connections. Administrators should verify that the switch, cabling, and powered device support compatible PoE standards and power requirements before deployment.

Question: 203. Which device commonly operates as the default gateway for hosts within a VLAN?

1. Layer 3 switch
   2. Patch panel
   3. Ethernet hub
   4. Network printer

Correct Answer: 1

Explanation: A Layer 3 switch can provide the default gateway for hosts within a VLAN by using a Layer 3 interface, such as a Switch Virtual Interface (SVI). The gateway receives traffic destined for remote networks and routes it toward the appropriate destination. A patch panel is a passive cabling component, while an Ethernet hub operates at Layer 1 and does not perform IP routing. A network printer is an endpoint rather than a network gateway. Using a Layer 3 switch as the gateway can also enable efficient inter-VLAN routing within an enterprise network.

Question: 204. Which protocol is commonly used to automatically assign IPv6 addresses and network parameters to hosts?

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

Correct Answer: 2

Explanation: DHCPv6 provides mechanisms for delivering IPv6 configuration information to clients. Depending on the deployment, DHCPv6 can provide addresses and additional configuration parameters such as DNS-related information. IPv6 also supports Stateless Address Autoconfiguration (SLAAC), which allows hosts to generate addresses using information advertised by routers. FTP is used for file transfers, SMTP handles email transport, and SNMP supports network management. Understanding the distinction between DHCPv6 and SLAAC is important when designing IPv6 networks and determining how hosts should obtain their addressing and configuration information.

Question: 205. Which IPv4 subnet mask corresponds to a /24 prefix length?

1. 255.255.0.0
   2. 255.0.0.0
   3. 255.255.255.0
   4. 255.255.255.252

Correct Answer: 3

Explanation: A /24 IPv4 prefix contains 24 network bits and 8 host bits. Its dotted-decimal subnet mask is 255.255.255.0. This subnet commonly provides 256 total IPv4 addresses, with 254 traditionally usable for hosts when conventional network and broadcast addresses are excluded. A /16 corresponds to 255.255.0.0, /8 corresponds to 255.0.0.0, and /30 corresponds to 255.255.255.252. Understanding CIDR notation and its corresponding subnet masks is fundamental when designing IPv4 addressing schemes and determining subnet sizes.

Question: 206. What is the primary purpose of route summarization?

1. Increase the number of VLANs
   2. Combine multiple routes into a summarized prefix
   3. Encrypt routing updates
   4. Replace all default gateways

Correct Answer: 2

Explanation: Route summarization combines multiple more-specific network routes into a broader summarized prefix. This can reduce the size of routing tables and decrease the amount of routing information that must be propagated. Summarization can also improve routing stability by limiting the scope of certain topology changes. It does not increase VLAN capacity, encrypt routing updates, or replace default gateways. Proper summarization requires careful address planning because the summarized prefix must accurately represent the networks it covers without unintentionally including unrelated destinations.

Question: 207. Which IPv4 mechanism allows a private internal address to be translated to a public address for Internet communication?

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

Correct Answer: 1

Explanation: Network Address Translation (NAT) translates IP addresses between different addressing domains. A common use is translating private internal IPv4 addresses into public addresses when traffic accesses external networks. NAT can conserve public IPv4 address space and provide a boundary between internal addressing and external addressing. LLDP is used for neighbor discovery, STP prevents Layer 2 loops, and NTP synchronizes system clocks. NAT implementations can operate in different forms, including one-to-one mappings and address or port translation, depending on the network’s requirements.

Question: 208. What is the main purpose of a network management system?

1. Replace Ethernet cabling
   2. Provide centralized monitoring and administration
   3. Eliminate IP addressing
   4. Convert VLANs into physical networks

Correct Answer: 2

Explanation: A network management system provides centralized tools for monitoring, managing, and analyzing network infrastructure. It can collect information about device availability, interface status, performance, alerts, configuration state, and other operational conditions. Centralized management helps administrators identify issues and maintain visibility across many devices. A network management system does not replace physical cabling, eliminate IP addressing, or convert logical VLANs into physical networks. In larger environments, centralized monitoring can significantly simplify operational tasks by presenting information from multiple devices through a common management interface.

Question: 209. Which protocol is commonly used to securely transfer files between network devices over an encrypted session?

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

Correct Answer: 3

Explanation: Secure File Transfer Protocol (SFTP) provides file transfer capabilities over an encrypted SSH session. It is commonly used when administrators need to securely move configuration files or other data between systems. Traditional FTP does not inherently encrypt its traffic, while TFTP is a lightweight file-transfer protocol without built-in authentication and encryption. HTTP is primarily a web communication protocol. SFTP therefore provides a more secure approach when file transfers contain configuration information or other data that should not be transmitted in plaintext.

Question: 210. Which type of address identifies a specific interface on an Ethernet network?

1. MAC address
   2. VLAN identifier
   3. DNS name
   4. Autonomous system number

Correct Answer: 1

Explanation: A Media Access Control (MAC) address identifies a network interface at the data-link layer. Ethernet switches use MAC addresses to learn which devices are reachable through particular ports and to make Layer 2 forwarding decisions. A VLAN identifier identifies a logical broadcast domain, a DNS name provides a human-readable name for a network resource, and an autonomous system number identifies a routing domain for certain Internet routing purposes. MAC addressing is therefore fundamental to Ethernet communication and switching.

Question: 211. What is the purpose of a network access control policy?

1. Increase fiber-optic distance
   2. Define which users or devices may access network resources
   3. Replace all routing tables
   4. Increase broadcast traffic

Correct Answer: 2

Explanation: A network access control policy defines requirements for determining which users or devices are permitted to access network resources. Policies can incorporate authentication, authorization, device identity, security posture, VLAN assignment, or other conditions depending on the implementation. Access control helps organizations enforce security requirements and limit unauthorized connectivity. It does not increase physical fiber distance, replace routing tables, or intentionally increase broadcast traffic. Effective access control policies should be clearly defined and aligned with the organization’s operational and security requirements.

Question: 212. Which wireless security protocol is commonly associated with modern WPA3-protected Wi-Fi networks?

1. OSPF
   2. SAE
   3. ARP
   4. LACP

Correct Answer: 2

Explanation: Simultaneous Authentication of Equals (SAE) is a key authentication mechanism associated with WPA3-Personal wireless security. SAE replaces the traditional WPA2-Personal pre-shared-key handshake approach with a password-authenticated key exchange designed to improve resistance against certain offline password-guessing attacks. OSPF is a routing protocol, ARP resolves IPv4 addresses to MAC addresses, and LACP manages link aggregation. Wireless security configuration should also consider the capabilities of clients and access points to ensure that the selected security mode is supported throughout the environment.

Question: 213. What is the purpose of a wireless access point in an enterprise network?

1. Provide wireless clients with network connectivity
   2. Translate domain names
   3. Replace all Layer 3 routing
   4. Store Ethernet MAC tables exclusively

Correct Answer: 1

Explanation: A wireless access point provides wireless clients with connectivity to a network infrastructure. It communicates with wireless stations over radio frequencies and typically bridges their traffic into the wired network. Enterprise access points can support features such as multiple SSIDs, authentication, encryption, VLAN assignment, roaming, and centralized management. DNS performs name resolution, routers provide Layer 3 forwarding, and switches maintain MAC address information. The access point is therefore a key component for integrating wireless users and devices into an organization’s wired and wireless network environment.

Question: 214. Which term describes the name that identifies a wireless network to users?

1. BSSID
   2. SSID
   3. VLAN ID
   4. Gateway address

Correct Answer: 2

Explanation: The Service Set Identifier (SSID) is the name commonly displayed to users when they select a wireless network. It identifies a wireless service set and allows users to distinguish one wireless network from another. The BSSID is associated with a specific wireless interface or access point radio, while a VLAN ID identifies a logical Layer 2 network. A gateway address identifies a Layer 3 next-hop device. Understanding the distinction between SSID and BSSID is important when configuring and troubleshooting enterprise wireless networks.

Question: 215. Which technology allows wireless clients to move between access points while maintaining network connectivity?

1. Network Address Translation
   2. DHCP relay
   3. Wireless roaming
   4. Port mirroring

Correct Answer: 3

Explanation: Wireless roaming allows a client to move between access points while maintaining connectivity to the wireless network. Properly designed roaming environments coordinate coverage, authentication, and client transitions so that movement between access points can occur with minimal disruption. The exact roaming behavior depends on wireless standards, client capabilities, authentication methods, and the WLAN architecture. NAT translates addresses, DHCP relay forwards DHCP messages between network segments, and port mirroring copies traffic for monitoring. Wireless roaming is therefore the function directly associated with client mobility between access points.

Question: 216. What does a DHCP relay agent allow when the DHCP server is located on another IP network?

1. It encrypts DHCP messages
   2. It forwards DHCP requests between network segments
   3. It replaces the DHCP server
   4. It converts IPv4 into IPv6

Correct Answer: 2

Explanation: A DHCP relay agent forwards DHCP messages between clients and a DHCP server located on a different IP network. Because DHCP clients initially use broadcast-based discovery, routers normally do not forward those broadcasts directly. A relay agent receives the client request and forwards it toward the configured DHCP server, allowing centralized DHCP services to support multiple subnets. The relay does not replace the DHCP server, encrypt the DHCP process, or convert IPv4 into IPv6. DHCP relay is particularly useful in enterprise networks with centralized address-management infrastructure.

Question: 217. Which troubleshooting approach involves starting at the physical layer and progressively checking higher network layers?

1. Top-down troubleshooting
   2. Random troubleshooting
   3. Bottom-up troubleshooting
   4. Application-only troubleshooting

Correct Answer: 3

Explanation: Bottom-up troubleshooting begins with the physical layer and progressively examines higher layers of the network stack. An administrator may first verify cables, power, link indicators, and interface status before checking VLANs, IP configuration, routing, and applications. This method can be particularly effective when there is a possibility of a basic connectivity problem. Top-down troubleshooting starts with the application layer instead, while random troubleshooting lacks a structured methodology. A systematic approach helps reduce unnecessary changes and makes it easier to isolate the actual source of a network problem.

Question: 218. Which symptom commonly indicates a duplex mismatch or other physical-link problem?

1. Increased DNS record availability
   2. Packet errors and degraded performance
   3. Successful time synchronization
   4. Correct VLAN naming

Correct Answer: 2

Explanation: Physical-link problems or duplex mismatches can result in packet errors, retransmissions, poor throughput, and degraded network performance. Interface statistics may reveal errors, collisions, drops, or other indicators that help identify such conditions. Administrators should examine both ends of the connection and verify that speed and duplex settings are compatible with the network design. DNS records, NTP synchronization, and VLAN naming do not directly indicate a physical Ethernet problem. Monitoring interface statistics is therefore an important step when investigating unexplained connectivity or performance issues.

Question: 219. Which tool can capture and inspect individual network packets for troubleshooting?

1. Packet analyzer
   2. Patch panel
   3. Power injector
   4. Cable label

Correct Answer: 1

Explanation: A packet analyzer captures and examines network traffic at the packet or frame level. Administrators can use packet captures to investigate protocols, connection attempts, retransmissions, addressing, VLAN tags, and other details that may not be visible through normal interface statistics. Packet analysis is useful when troubleshooting complex connectivity or application problems. A patch panel is a physical cabling component, a power injector supplies power in certain PoE deployments, and a cable label provides identification information. Packet analyzers therefore provide detailed visibility into actual network traffic.

Question: 220. Why is network documentation important during troubleshooting and maintenance?

1. It prevents every possible network failure
   2. It eliminates the need for configuration backups
   3. It increases switch forwarding speed
   4. It provides a reference for topology, configurations, and operational changes

Correct Answer: 4

Explanation: Network documentation provides a reference for understanding topology, device roles, addressing, VLAN assignments, configurations, cabling, and operational procedures. Accurate documentation helps administrators troubleshoot problems more efficiently and reduces the risk of making changes based on incorrect assumptions. It can also support change management, recovery procedures, and future network expansion. Documentation does not prevent every failure, increase switch forwarding speed, or eliminate the need for configuration backups. Maintaining current network records is therefore an important operational practice for reliable network administration.