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Question 281

Which command output is most useful for verifying the operational state and IP address information of an Aruba CX interface?

1. show lldp neighbors
2. show interface brief
3. show vlan
4. show spanning-tree

Correct Answer: 2

Explanation

The show interface brief command provides a concise overview of interfaces and commonly includes operational status and addressing information. It is useful when an administrator needs a quick view of whether interfaces are up or down and wants to identify their configured Layer 3 information. show lldp neighbors focuses on connected neighboring devices, show vlan displays VLAN information, and show spanning-tree provides spanning-tree details. During initial troubleshooting, a brief interface summary can quickly identify an interface that is administratively disabled or operationally down.

Question 282

Which VLAN configuration allows multiple VLANs to traverse a single Ethernet link between network devices?

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

Correct Answer: 4

Explanation

A trunk link allows multiple VLANs to traverse a single physical Ethernet connection. VLAN tagging, commonly based on IEEE 802.1Q, identifies the VLAN associated with frames crossing the trunk. Trunks are frequently used between switches, between switches and routers, or between switches and virtualization platforms. An access port normally carries traffic for one VLAN, while native and voice VLANs are specific VLAN roles rather than the general link type. Correct trunk configuration requires consistent VLAN permissions and compatible tagging expectations on both ends of the connection.

Question 283

Which feature prevents a switch from forwarding frames indefinitely around a Layer 2 loop?

1. Spanning Tree Protocol
2. RADIUS
3. DHCP relay
4. NTP

Correct Answer: 1

Explanation

Spanning Tree Protocol prevents Layer 2 switching loops by calculating a loop-free logical topology and placing selected redundant paths into a blocking or alternate state. Without loop prevention, redundant Ethernet connections could allow broadcast and unknown-unicast frames to circulate continuously, causing severe network instability. RADIUS provides authentication, DHCP relay forwards DHCP requests across routed networks, and NTP provides time synchronization. STP is particularly important in networks where redundant switch connections exist, because physical redundancy can otherwise introduce Layer 2 loops.

Question 284

Which routing method requires an administrator to manually configure the destination network and next hop?

1. OSPF
2. BGP
3. Static routing
4. DHCP

Correct Answer: 3

Explanation

Static routing requires an administrator to manually configure routing information, such as a destination prefix and next-hop address or outgoing interface. Static routes do not automatically learn topology changes like dynamic routing protocols do. They can be useful for simple networks, default routes, backup paths, or specific destinations where predictable forwarding is desired. OSPF and BGP dynamically exchange routing information, while DHCP provides IP configuration services. Administrators should carefully verify static route destinations and next hops because an incorrect configuration can create unreachable networks or routing loops.

Question 285

Which Aruba CX feature can monitor network and system conditions using agents and predefined or customized monitoring logic?

1. NAE
2. LACP
3. VRRP
4. ARP

Correct Answer: 1

Explanation

The Network Analytics Engine, or NAE, provides monitoring and analytics capabilities on Aruba CX switches. It can use agents to observe selected system and network conditions and can generate information when monitored behavior meets configured criteria. This helps administrators detect issues without continuously reviewing large amounts of raw command output. LACP manages link aggregation, VRRP provides gateway redundancy, and ARP resolves IPv4 addresses to MAC addresses. NAE can therefore support proactive monitoring and troubleshooting by providing visibility into operational conditions on the switch.

Question 286

Which protocol is used to exchange routing information between BGP peers?

1. OSPF
2. BGP
3. LLDP
4. SNMP

Correct Answer: 2

Explanation

BGP peers exchange routing information using BGP sessions. BGP is a path-vector routing protocol designed primarily for exchanging reachability information between autonomous systems, although it can also be used within an autonomous system. BGP uses attributes to support routing-policy decisions and route selection. OSPF is an interior gateway protocol, LLDP discovers directly connected neighbors, and SNMP is used for network management and monitoring. Establishing a BGP session requires appropriate peer addressing, autonomous-system configuration, and network reachability between the participating devices.

Question 287

Which technology can provide centralized monitoring and configuration of multiple Aruba network devices?

1. Aruba Central
2. VRRP
3. ARP
4. STP

Correct Answer: 1

Explanation

Aruba Central provides centralized management, monitoring, configuration, and visibility for supported Aruba networking devices. Instead of managing every device independently, administrators can use centralized tools to organize sites, apply configuration, review device health, and monitor network events. VRRP is used for gateway redundancy, ARP resolves IPv4 addresses, and STP prevents Layer 2 loops. Centralized management can simplify operations in environments with many switches and access points because administrators can maintain consistent policies and gain a broader view of the infrastructure.

Question 288

Which protocol is commonly used by network management systems to collect device monitoring information?

1. SSH
2. SNMP
3. OSPF
4. DHCP

Correct Answer: 2

Explanation

Simple Network Management Protocol, or SNMP, is commonly used by network management systems to collect monitoring information from network devices. Depending on the configured version and implementation, SNMP can provide information about interface status, traffic counters, system resources, and other operational data. SSH provides secure remote CLI access, OSPF exchanges routing information, and DHCP provides IP configuration. SNMP is useful for centralized monitoring because a management platform can collect information from many devices and present it through dashboards, alerts, or historical performance reports.

Question 289

Which security mechanism can use DHCP snooping bindings to validate ARP traffic?

1. Dynamic ARP Protection
2. NTP
3. LACP
4. BGP

Correct Answer: 1

Explanation

Dynamic ARP Protection can use trusted IP-to-MAC binding information to validate ARP messages and help prevent ARP spoofing attacks. DHCP snooping can create binding information containing details such as the client’s IP address, MAC address, VLAN, and switch interface. When Dynamic ARP Protection is configured appropriately, ARP traffic can be checked against these bindings. NTP synchronizes device clocks, LACP aggregates links, and BGP exchanges routing information. Combining DHCP snooping with ARP protection can provide stronger Layer 2 security against unauthorized address mappings.

Question 290

Which IPv4 address range is commonly used for private internal networks?

1. 8.8.8.0/24
2. 169.254.0.0/16
3. 192.168.0.0/16
4. 224.0.0.0/4

Correct Answer: 3

Explanation

The 192.168.0.0/16 range is one of the IPv4 private address ranges defined for internal networks. Private addresses are commonly used within homes, offices, and enterprise networks and are not normally routed directly across the public Internet. Other private IPv4 ranges include 10.0.0.0/8 and 172.16.0.0/12. The 169.254.0.0/16 range is commonly associated with link-local addressing, while 224.0.0.0/4 is used for IPv4 multicast. Private addressing is frequently combined with NAT when internal hosts require Internet connectivity.

Question 291

Which protocol provides secure command-line access to an Aruba CX switch over an IP network?

1. Telnet
2. FTP
3. SSH
4. TFTP

Correct Answer: 3

Explanation

SSH provides secure remote command-line access to network devices. It encrypts the management session, helping protect credentials and administrative commands from being exposed over the network. SSH is therefore generally preferred over insecure remote-management methods such as Telnet. FTP and TFTP are primarily used for file transfers rather than interactive device management. When deploying SSH, administrators should configure appropriate authentication, access restrictions, and key-management practices. Secure remote administration is particularly important when switches are managed across shared or untrusted network infrastructure.

Question 292

Which protocol can dynamically distribute IPv4 addresses and related configuration parameters to clients?

1. DHCP
2. BGP
3. LLDP
4. RADIUS

Correct Answer: 1

Explanation

Dynamic Host Configuration Protocol, or DHCP, automatically provides IPv4 clients with configuration information such as an IP address, subnet mask, default gateway, and DNS server information. This reduces the need to configure every endpoint manually and allows administrators to manage address allocation centrally. BGP handles routing between autonomous systems, LLDP provides neighbor discovery, and RADIUS provides authentication and authorization. DHCP is particularly useful in enterprise environments where many endpoints frequently connect to the network and require consistent IP configuration.

Question 293

Which interface aggregation protocol can negotiate link membership between compatible devices?

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

Correct Answer: 2

Explanation

LACP allows compatible network devices to negotiate and maintain link aggregation. Multiple physical interfaces can be combined into a logical aggregated connection, improving redundancy and potentially increasing available bandwidth. LACP can identify compatible interfaces and help manage their participation in the aggregation group. ARP resolves IPv4 addresses, NTP synchronizes time, and OSPF exchanges internal routing information. Correctly configured LACP is especially useful for switch-to-switch and switch-to-server connections where administrators need multiple physical links to operate together as one logical connection.

Question 294

Which route is commonly configured as a fallback destination for traffic when no more specific route exists?

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

Correct Answer: 1

Explanation

A default route provides a fallback path for packets when the routing table does not contain a more specific matching route. In IPv4, it is commonly represented as 0.0.0.0/0, while IPv6 uses ::/0. The router forwards unmatched traffic toward the configured next hop or outgoing interface associated with the default route. Host routes provide highly specific destinations, connected routes represent directly attached networks, and loopback routes are associated with logical interfaces. Default routes are frequently used on enterprise edge devices to forward Internet-bound traffic.

Question 295

Which protocol can provide redundant default-gateway functionality for hosts on an IPv4 subnet?

1. SNMP
2. VRRP
3. LLDP
4. DHCP

Correct Answer: 2

Explanation

VRRP provides redundant default-gateway functionality by presenting a virtual router address to hosts. Multiple routers can participate in the same VRRP group, with one operating as the active forwarding device and another available to take over when necessary. Hosts can continue using the same virtual gateway address without needing to know which physical router is currently forwarding traffic. SNMP is used for management, LLDP discovers neighbors, and DHCP provides IP configuration. VRRP is therefore useful for improving gateway availability in enterprise networks.

Question 296

Which feature can provide information about directly connected network devices and their interfaces?

1. DHCP snooping
2. LLDP
3. OSPF
4. NAT

Correct Answer: 2

Explanation

LLDP provides information about directly connected devices by allowing network equipment to advertise identifying and capability information to neighboring devices. Administrators can use LLDP information to determine which device is connected to a particular interface and to understand aspects of the physical topology. DHCP snooping protects DHCP operations, OSPF exchanges routing information, and NAT translates addresses between different addressing domains. LLDP is especially useful during troubleshooting because it can help confirm physical connectivity and identify unexpected neighboring devices or cabling.

Question 297

Which type of route represents a network that is directly connected to a router interface?

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

Correct Answer: 3

Explanation

A connected route represents a network that is directly attached to an active Layer 3 interface. When an interface has an appropriate IP address and subnet mask and becomes operational, the associated network can normally appear as a connected route in the routing table. Static routes are manually configured, default routes provide fallback forwarding, and BGP routes are learned through BGP sessions. Connected routes are important because they provide the router with direct knowledge of networks reachable through its own interfaces.

Question 298

Which protocol prevents unauthorized users from gaining network access by requiring authentication at the switch port?

1. NTP
2. 802.1X
3. LACP
4. sFlow

Correct Answer: 2

Explanation

802.1X provides port-based network access control by requiring authentication before a client receives normal network access. In a common deployment, the client acts as the supplicant, the switch serves as the authenticator, and a RADIUS server performs authentication. This approach allows organizations to control which users or devices can access the wired network. NTP synchronizes time, LACP manages link aggregation, and sFlow provides traffic monitoring. 802.1X can therefore provide an important access-control layer at the network edge.

Question 299

Which traffic-monitoring technology uses packet sampling rather than requiring every packet to be collected?

1. sFlow
2. VRRP
3. RADIUS
4. DHCP relay

Correct Answer: 1

Explanation

sFlow uses packet sampling and interface counters to provide visibility into network traffic. Instead of requiring every packet to be captured and stored, selected traffic samples can be sent to an sFlow collector for analysis. This approach can provide useful information about traffic sources, destinations, protocols, and utilization while reducing the overhead associated with full packet capture. VRRP provides gateway redundancy, RADIUS handles authentication, and DHCP relay forwards DHCP requests between subnets. sFlow is useful for capacity planning, troubleshooting, and identifying unusual traffic patterns.

Question 300

Which IPv6 feature allows a host to learn network prefixes from routers and configure its own address?

1. NAT
2. DHCP snooping
3. SLAAC
4. ARP

Correct Answer: 3

Explanation

SLAAC enables IPv6 hosts to configure addresses automatically using information received through Router Advertisements. The router advertises an IPv6 prefix, and the host uses that information to construct an address appropriate for the network. SLAAC can simplify IPv6 deployment because hosts do not necessarily require manual address configuration. NAT and ARP are primarily associated with IPv4 networking, while DHCP snooping is a Layer 2 security feature. When troubleshooting SLAAC, administrators should verify IPv6 routing, Router Advertisements, and the advertised prefix configuration.