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Question 321

Which Aruba CX feature provides a virtual switching system that allows two switches to operate as a highly available pair?

1. STP
2. LACP
3. VSX
4. SNMP

Correct Answer: 3

Explanation

VSX, or Virtual Switching Extension, allows two Aruba CX switches to operate as a coordinated high-availability pair. It provides redundancy while allowing connected devices to use links toward both switches. VSX designs commonly use a peer link and a keepalive mechanism to maintain communication and determine peer status. STP is used for Layer 2 loop prevention, LACP provides link aggregation, and SNMP provides network-management information. VSX is particularly useful in data center and campus designs where minimizing downtime and providing redundant switching paths are important requirements.

Question 322

Which command is useful for checking the IP routing table on an Aruba CX switch?

1. show ip route
2. show vlan
3. show lldp neighbors
4. show interface transceiver

Correct Answer: 1

Explanation

The show ip route command displays the IPv4 routing table on an Aruba CX switch. It can show connected, static, dynamic, and other available routes depending on the configuration. Administrators can use the output to determine whether a destination network is known and which next hop or interface will be used. show vlan focuses on VLAN information, show lldp neighbors provides neighbor information, and show interface transceiver provides transceiver-related details. Reviewing the routing table is an important troubleshooting step when investigating Layer 3 connectivity problems.

Question 323

Which protocol is commonly used to dynamically exchange IPv4 routing information within an enterprise network?

1. RADIUS
2. NTP
3. LLDP
4. OSPF

Correct Answer: 4

Explanation

OSPF is a dynamic interior gateway routing protocol commonly used to exchange routing information within enterprise networks. It is a link-state protocol that allows routers to build a topology database and calculate paths using the Shortest Path First algorithm. OSPF supports hierarchical network designs through areas and can converge when topology changes occur. RADIUS provides authentication, NTP synchronizes clocks, and LLDP provides neighbor discovery. OSPF is particularly useful when a network has multiple routers and manually maintaining static routes would become difficult or inefficient.

Question 324

Which port configuration is normally used to connect an end-user workstation that belongs to a single VLAN?

1. Trunk
2. Access
3. Routed
4. Loopback

Correct Answer: 2

Explanation

An access port is normally used to connect an end-user device that belongs to one VLAN. The switch associates the port with a specific VLAN, and traffic sent to the workstation is typically transmitted without an 802.1Q VLAN tag. Trunk ports are designed to carry multiple VLANs, routed interfaces provide Layer 3 connectivity, and loopback interfaces are logical interfaces commonly used for management or routing purposes. Correctly assigning the access VLAN ensures that the endpoint participates in the intended Layer 2 broadcast domain.

Question 325

Which technology combines multiple Ethernet interfaces into one logical connection?

1. VRRP
2. OSPF
3. LAG
4. NTP

Correct Answer: 3

Explanation

A Link Aggregation Group, or LAG, combines multiple physical Ethernet interfaces into a single logical connection. This provides link redundancy and can increase aggregate bandwidth when traffic is distributed across the member links. LAGs are frequently used between switches and between switches and servers. LACP can dynamically negotiate the membership of compatible links. VRRP provides gateway redundancy, OSPF handles dynamic routing, and NTP provides time synchronization. Administrators should ensure that member interfaces have compatible settings so that the aggregation operates as intended.

Question 326

Which security feature helps prevent a switch port from accepting unauthorized DHCP server responses?

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

Correct Answer: 4

Explanation

DHCP snooping helps protect networks from rogue DHCP servers by identifying trusted and untrusted switch interfaces. DHCP server responses are expected to originate from trusted interfaces, while client-facing interfaces can be configured as untrusted. This prevents unauthorized devices from responding to DHCP requests and distributing incorrect addressing information. DHCP snooping can also create IP-to-MAC binding information that other security features can use. OSPF handles routing, VRRP provides gateway redundancy, and LLDP provides neighbor discovery. DHCP snooping is therefore an important Layer 2 security feature.

Question 327

Which protocol provides secure remote CLI access to an Aruba CX switch?

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

Correct Answer: 1

Explanation

Secure Shell, or SSH, provides encrypted remote command-line access to an Aruba CX switch. It protects management sessions by encrypting the communication between the administrator and the device. This helps protect usernames, passwords, commands, and other management information from interception. Telnet provides remote CLI access but does not provide the same encryption protection. TFTP and FTP are primarily file-transfer protocols. For remote administration across networks where traffic may be exposed to other systems, SSH is generally preferred because it provides secure management communication.

Question 328

Which protocol can provide centralized authentication for network users and administrators?

1. SNMP
2. RADIUS
3. OSPF
4. sFlow

Correct Answer: 2

Explanation

RADIUS is commonly used to provide centralized authentication, authorization, and accounting services. Network devices can communicate with a RADIUS server to validate user credentials and apply centralized access policies. This approach can reduce the need to maintain separate user accounts on every network device. SNMP is primarily used for monitoring and management, OSPF exchanges routing information, and sFlow provides traffic sampling. RADIUS can be integrated with enterprise identity systems and is frequently used with network-access technologies such as 802.1X.

Question 329

Which IPv4 address range is reserved for private network addressing?

1. 100.64.0.0/10
2. 127.0.0.0/8
3. 169.254.0.0/16
4. 10.0.0.0/8

Correct Answer: 4

Explanation

The 10.0.0.0/8 address range is one of the three IPv4 private address ranges defined for internal network use. Private addresses are commonly assigned to devices inside enterprise networks and are not directly routed across the public Internet. The other major private ranges are 172.16.0.0/12 and 192.168.0.0/16. The 127.0.0.0/8 range is reserved for loopback, while 169.254.0.0/16 is associated with IPv4 link-local addressing. Private addressing is frequently combined with NAT for Internet connectivity.

Question 330

Which Aruba CX feature can continuously analyze switch conditions and generate alerts based on monitored events?

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

Correct Answer: 3

Explanation

The Network Analytics Engine, or NAE, provides monitoring and analytics capabilities on supported Aruba CX switches. NAE agents can monitor selected operational conditions and generate information or alerts when defined events occur. This allows administrators to identify potential issues without manually checking command output continuously. LACP manages link aggregation, VRRP provides gateway redundancy, and DHCP provides host configuration. NAE can be useful for proactive troubleshooting because it provides visibility into system and network behavior directly from the switching platform.

Question 331

Which routing protocol is designed primarily for exchanging routes between autonomous systems?

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

Correct Answer: 2

Explanation

Border Gateway Protocol, or BGP, is designed primarily for exchanging routing information between autonomous systems. It is a path-vector protocol that supports extensive routing policies through attributes and route-selection mechanisms. BGP is the primary routing protocol used for Internet-scale interdomain routing. OSPF is generally used for internal routing, LLDP provides Layer 2 neighbor discovery, and DHCP provides host configuration. BGP can also be deployed within an autonomous system, but its most prominent role is exchanging reachability information between separate autonomous systems.

Question 332

Which protocol is used to synchronize the clocks of network devices with a time source?

1. NTP
2. SNMP
3. RADIUS
4. STP

Correct Answer: 1

Explanation

Network Time Protocol, or NTP, is used to synchronize the clocks of network devices and other systems. Accurate time is important for event logging, troubleshooting, security monitoring, authentication, and correlating events across multiple devices. A network device can synchronize its clock with a configured NTP server or other time source. SNMP provides management information, RADIUS handles authentication, and STP prevents Layer 2 loops. Consistent time across switches, routers, servers, and monitoring platforms makes it easier to understand the sequence and timing of network events.

Question 333

Which technology allows IPv6 hosts to automatically configure addresses using information advertised by routers?

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

Correct Answer: 4

Explanation

Stateless Address Autoconfiguration, or SLAAC, allows IPv6 hosts to automatically configure addresses based on information received through Router Advertisement messages. The router advertises an IPv6 prefix, and the host uses that information to form an IPv6 address. SLAAC reduces the need for manual IPv6 address configuration and can simplify large deployments. NAT and ARP are commonly associated with IPv4 networking, while DHCP snooping is a Layer 2 security feature. Administrators troubleshooting SLAAC should verify IPv6 routing, Router Advertisements, and the advertised network prefix.

Question 334

Which mechanism determines which route is preferred when multiple routes match the same destination?

1. MAC learning
2. VLAN tagging
3. Longest prefix match
4. LLDP

Correct Answer: 3

Explanation

Longest prefix match is used when multiple routes match a destination. The router selects the route with the most specific network prefix. For example, if both a /16 and a /24 route match a destination, the /24 route is more specific and is normally selected. MAC address learning is a Layer 2 switching function, VLAN tagging identifies VLAN membership on tagged links, and LLDP discovers neighboring devices. Understanding longest prefix matching is important when troubleshooting routing behavior because a more specific route can override a broader summary or default route.

Question 335

Which protocol provides a standards-based method for port-based network access control?

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

Correct Answer: 2

Explanation

IEEE 802.1X provides port-based network access control. It can require a connected device or user to authenticate before normal network access is granted. A typical deployment involves a supplicant on the endpoint, an authenticator such as an Ethernet switch, and an authentication server such as RADIUS. NTP provides time synchronization, BGP exchanges routing information, and sFlow provides sampled traffic monitoring. 802.1X is commonly used in enterprise environments to prevent unauthorized endpoints from obtaining unrestricted network access through switch ports.

Question 336

Which command would help an administrator identify devices directly connected to an Aruba CX switch?

1. show lldp neighbors
2. show ip route
3. show vlan
4. show clock

Correct Answer: 1

Explanation

The show lldp neighbors command displays information about neighboring devices discovered through LLDP. This can help administrators identify what is connected to each switch interface and verify physical network topology. Depending on the available information, the output can include the neighboring device identity, local interface, remote interface, and other details. show ip route displays routing information, show vlan provides VLAN information, and show clock displays time-related information. LLDP neighbor information is particularly useful when troubleshooting unexpected physical connections or documenting switch connectivity.

Question 337

Which feature provides a redundant default gateway using a shared virtual IP address?

1. VRRP
2. LACP
3. LLDP
4. sFlow

Correct Answer: 1

Explanation

VRRP provides first-hop gateway redundancy by allowing multiple routers to participate in a virtual router group. The participating devices share a virtual IP address that hosts can use as their default gateway. One device normally performs the active forwarding role, while another can take over when the active device becomes unavailable. LACP combines physical links, LLDP provides neighbor discovery, and sFlow provides traffic monitoring. VRRP is useful in networks where uninterrupted default-gateway availability is important because hosts can continue using the same gateway address during a router transition.

Question 338

Which technology allows traffic from several VLANs to be carried across one physical switch-to-switch link?

1. Access VLAN
2. Routed interface
3. Loopback
4. Trunk

Correct Answer: 4

Explanation

A trunk link can carry traffic belonging to multiple VLANs across a single physical Ethernet connection. VLAN tagging is used to identify frames belonging to different VLANs as they cross the trunk. Trunks are commonly configured between switches and can also be used with other devices that support VLAN tagging. An access port normally carries one VLAN, a routed interface provides Layer 3 connectivity, and a loopback is a logical interface. Correct trunk configuration requires compatible VLAN and tagging settings on both ends of the connection.

Question 339

Which security feature can inspect ARP messages against trusted IP-to-MAC binding information?

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

Correct Answer: 1

Explanation

Dynamic ARP Protection helps protect a Layer 2 network from certain ARP spoofing attacks by validating ARP packets against trusted IP-to-MAC binding information. In environments using DHCP snooping, the switch can learn bindings from legitimate DHCP transactions. Dynamic ARP Protection can then use those bindings when evaluating ARP traffic. NTP synchronizes time, OSPF handles dynamic routing, and LACP manages link aggregation. Proper configuration of these security mechanisms can reduce the risk of malicious hosts sending false ARP information and redirecting traffic within a local network.

Question 340

Which protocol can be used by a network monitoring platform to collect interface counters and device information?

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

Correct Answer: 2

Explanation

Simple Network Management Protocol, or SNMP, is widely used by network management platforms to collect operational information from network devices. Depending on the configured SNMP version and available objects, monitoring systems can retrieve information such as interface counters, device status, resource utilization, and other operational statistics. SSH provides secure interactive CLI access, OSPF exchanges routing information, and VRRP provides gateway redundancy. SNMP is particularly useful when many network devices need to be monitored centrally because a management platform can collect information and generate dashboards, alerts, and historical reports.