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Question 361

Which Aruba CX technology allows two switches to provide redundant connectivity while operating as a coordinated pair?

1. LACP
2. VRRP
3. VSX
4. NTP

Correct Answer: 3

Explanation

Virtual Switching Extension (VSX) allows two Aruba CX switches to operate as a coordinated pair and provide high availability. The design supports redundant connections and helps reduce the impact of a single switch failure. VSX uses mechanisms such as a peer link and keepalive to maintain communication and determine peer status. LACP provides link aggregation, VRRP provides gateway redundancy, and NTP synchronizes system clocks. VSX is commonly used in enterprise and data center environments where devices require resilient connections to the switching infrastructure.

Question 362

Which command can be used to examine the routing information available on an Aruba CX switch?

1. show vlan
2. show ip route
3. show lldp neighbors
4. show mac-address-table

Correct Answer: 2

Explanation

The show ip route command displays the IPv4 routing table on an Aruba CX switch. It can show routes learned through connected interfaces, static configuration, and dynamic routing protocols. Administrators can use this information to determine whether a destination is known and which path the switch will use. VLAN information is displayed with show vlan, neighbor information with show lldp neighbors, and Layer 2 MAC entries with show mac-address-table. Reviewing the routing table is a fundamental step when diagnosing Layer 3 connectivity issues.

Question 363

Which protocol is primarily used to provide centralized authentication and authorization for network access?

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

Correct Answer: 1

Explanation

RADIUS provides centralized authentication, authorization, and accounting services for network environments. A switch, router, wireless controller, or other network device can send authentication requests to a RADIUS server instead of relying exclusively on local credentials. RADIUS is commonly integrated with technologies such as 802.1X to control network access. OSPF handles routing, LLDP provides neighbor discovery, and NTP synchronizes clocks. Centralized authentication can simplify administration because user credentials and access policies can be managed through a common authentication infrastructure.

Question 364

Which feature allows multiple physical links to operate as one logical connection?

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

Correct Answer: 2

Explanation

LACP, or Link Aggregation Control Protocol, allows compatible devices to dynamically establish and maintain an aggregated link. Multiple physical Ethernet interfaces can operate together as one logical connection, providing redundancy and potentially increasing aggregate bandwidth. LACP helps ensure that only compatible links participate in the aggregation. VRRP provides gateway redundancy, SNMP provides network-management information, and DHCP provides IP configuration. Link aggregation is commonly used between switches or between a switch and a server where multiple physical connections are required for resilience and capacity.

Question 365

Which IPv4 address is within a private address range?

1. 172.20.10.5
2. 8.8.8.8
3. 1.1.1.1
4. 203.0.113.10

Correct Answer: 1

Explanation

The address 172.20.10.5 belongs to the private IPv4 range 172.16.0.0/12. Private IPv4 addresses are intended for internal network use and are not directly routed across the public Internet. The other addresses shown are not members of the standard private IPv4 ranges. The three major private ranges are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. Private addressing is widely used in enterprise networks and is often combined with Network Address Translation when internal hosts need access to public networks.

Question 366

Which protocol is responsible for preventing Layer 2 switching loops in a redundant Ethernet topology?

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

Correct Answer: 3

Explanation

Spanning Tree Protocol (STP) prevents Layer 2 loops by creating a loop-free logical topology while still allowing redundant physical links. STP determines which paths should forward traffic and which redundant paths should remain in a non-forwarding state. This prevents broadcast storms and continuously circulating Ethernet frames. BGP is used for routing between autonomous systems, DHCP provides host configuration, and RADIUS provides authentication services. STP is especially important in networks with redundant switch connections because physical redundancy without loop prevention can cause serious network instability.

Question 367

Which protocol allows IPv6 hosts to discover routers and obtain network-prefix information?

1. NDP
2. ARP
3. RADIUS
4. LACP

Correct Answer: 1

Explanation

IPv6 Neighbor Discovery Protocol (NDP) provides several functions related to neighbor and router discovery. Router Advertisement messages can provide hosts with information about available routers and IPv6 network prefixes. NDP also supports address resolution and other neighbor-related operations through ICMPv6. IPv6 does not use ARP in the same way IPv4 does. RADIUS provides authentication and LACP manages link aggregation. Understanding NDP is important when deploying IPv6 because incorrect Router Advertisement or neighbor-discovery behavior can prevent hosts from configuring or communicating correctly.

Question 368

Which Aruba CX capability is designed for continuous monitoring and analytics of switch operation?

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

Correct Answer: 2

Explanation

The Network Analytics Engine (NAE) provides monitoring and analytics capabilities on supported Aruba CX switches. NAE agents can monitor system and network conditions and provide information when configured thresholds or events occur. This can help administrators identify abnormal behavior and investigate potential issues proactively. LACP handles link aggregation, VRRP provides gateway redundancy, and DHCP supplies IP configuration. NAE can reduce the need for continuous manual monitoring because it can observe selected conditions directly on the switch and provide useful diagnostic information.

Question 369

Which protocol is used to exchange routing information between autonomous systems?

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

Correct Answer: 3

Explanation

Border Gateway Protocol (BGP) is designed to exchange routing information between autonomous systems. It uses path attributes and routing policies to determine how routes should be selected and advertised. BGP is fundamental to Internet routing and is also used in enterprise and service-provider environments where advanced policy control is required. OSPF is generally used for internal routing, NTP synchronizes clocks, and LLDP discovers directly connected devices. Because BGP can influence large numbers of routes, administrators need to carefully design and verify routing policies before deploying it.

Question 370

Which feature can help prevent rogue DHCP servers from supplying incorrect network configuration to clients?

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

Correct Answer: 1

Explanation

DHCP snooping helps protect a Layer 2 network against unauthorized DHCP servers. The switch can classify interfaces as trusted or untrusted, with legitimate DHCP server responses expected to arrive through trusted interfaces. This helps prevent rogue devices from distributing incorrect IP addresses, gateways, or DNS information to clients. DHCP snooping can also create binding information containing details about legitimate DHCP assignments. VRRP provides gateway redundancy, OSPF handles routing, and sFlow monitors traffic. DHCP snooping is therefore an important security feature for switched networks.

Question 371

Which protocol is used to synchronize network-device clocks with a configured time source?

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

Correct Answer: 2

Explanation

Network Time Protocol (NTP) synchronizes the clocks of network devices with configured time sources. Consistent time is important for accurate event logs, security investigations, troubleshooting, authentication, and correlation of events across multiple systems. Network administrators can configure devices to use reliable NTP servers or other trusted time sources. SNMP is used for network management, RADIUS handles authentication, and BGP exchanges routing information. Without synchronized clocks, timestamps from different network devices may be difficult to compare, making troubleshooting and incident analysis more complicated.

Question 372

Which command provides information about directly connected neighbors discovered through LLDP?

1. show ip route
2. show vlan
3. show lldp neighbors
4. show spanning-tree

Correct Answer: 3

Explanation

The show lldp neighbors command displays information learned through the Link Layer Discovery Protocol. Administrators can use this information to identify directly connected network devices and understand how interfaces are physically connected. Depending on the platform and configuration, the output can include local interface, neighboring device, remote interface, and system information. show ip route displays routing information, show vlan displays VLAN information, and show spanning-tree displays STP details. LLDP neighbor information is particularly useful for troubleshooting physical topology and unexpected device connections.

Question 373

Which routing principle selects the route with the most specific matching prefix?

1. Longest prefix match
2. Round-robin selection
3. MAC learning
4. VLAN priority

Correct Answer: 1

Explanation

Longest prefix match means that a router selects the most specific route matching the destination IP address. A route with a longer prefix represents a smaller and more specific network. For example, a /24 route is more specific than a /16 route when both match the same destination. This principle allows routing tables to contain broad summary routes while still supporting specific exceptions. MAC learning is a Layer 2 process, while VLAN priority is unrelated to route selection. Understanding longest prefix match is essential when troubleshooting unexpected forwarding behavior.

Question 374

Which protocol provides a virtual default gateway for hosts when redundant routers are available?

1. LACP
2. VRRP
3. NTP
4. SNMP

Correct Answer: 2

Explanation

Virtual Router Redundancy Protocol (VRRP) allows multiple routers to provide a shared virtual gateway address. Hosts can use the virtual IP address as their default gateway without needing to know which physical router is currently forwarding traffic. One router normally performs the active role, while another can assume forwarding responsibility if the active device becomes unavailable. LACP provides link aggregation, NTP synchronizes clocks, and SNMP supports network management. VRRP is therefore useful for improving the availability of default-gateway services in enterprise networks.

Question 375

Which Aruba CX feature can be used to monitor traffic and system conditions directly on the switch?

1. VSX
2. NAE
3. STP
4. ARP

Correct Answer: 2

Explanation

The Network Analytics Engine (NAE) provides monitoring and analytics directly on supported Aruba CX switches. Administrators can configure or use agents that monitor selected network and system conditions and provide information when defined events occur. This can support proactive troubleshooting and help identify performance or operational problems. VSX provides high availability, STP prevents Layer 2 loops, and ARP resolves IPv4 addresses to MAC addresses. NAE is valuable when administrators need continuous visibility into switch behavior without manually checking operational commands at regular intervals.

Question 376

Which technology can provide sampled traffic statistics for network analysis?

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

Correct Answer: 4

Explanation

sFlow provides sampled traffic information and interface statistics for network monitoring and analysis. It sends sampled data to a collector, where administrators can examine traffic patterns, sources, destinations, protocols, and utilization. Because sFlow relies on sampling rather than capturing every packet, it can provide useful visibility while reducing monitoring overhead. RADIUS provides authentication, DHCP supplies IP configuration, and VRRP provides gateway redundancy. sFlow can be particularly useful for capacity planning, identifying high-bandwidth applications, and investigating unusual traffic patterns across a network.

Question 377

Which interface type normally assigns an IP address directly to a Layer 3 switch interface for routing?

1. Routed interface
2. Access interface
3. Trunk interface
4. Mirror interface

Correct Answer: 1

Explanation

A routed interface operates at Layer 3 and can have an IP address assigned directly to it. It is commonly used for routed connections between network devices, such as switches, routers, and firewalls. Unlike an access interface, it is not primarily associated with a single Layer 2 VLAN. A trunk carries multiple VLANs, while a mirror interface is used for traffic monitoring. Routed interfaces are useful in designs where a switch must participate directly in IP routing rather than simply forwarding Ethernet frames within VLANs.

Question 378

Which protocol can provide centralized authentication for 802.1X network access?

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

Correct Answer: 3

Explanation

RADIUS is commonly used as the authentication server protocol in 802.1X deployments. The switch acts as the authenticator and communicates with the RADIUS server to validate authentication requests from connected clients. This allows organizations to centrally control network access based on user or device credentials. OSPF provides dynamic routing, LLDP provides neighbor discovery, and NTP synchronizes device clocks. Combining 802.1X with RADIUS can provide strong access control at the network edge and allows authentication policies to be managed centrally.

Question 379

Which protocol is used by network devices to advertise their identity and capabilities to directly connected neighbors?

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

Correct Answer: 3

Explanation

Link Layer Discovery Protocol (LLDP) allows network devices to advertise identifying and capability information to directly connected neighbors. This can help administrators discover physical topology, verify connections, and identify the device connected to a particular interface. LLDP information can include device identity, local and remote interfaces, and system capabilities depending on the implementation. DHCP provides IP configuration, BGP exchanges routing information, and NAT performs address translation. LLDP is especially useful when documenting or troubleshooting the physical structure of a switched network.

Question 380

Which IPv6 mechanism allows a host to automatically configure an address based on router advertisements?

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

Correct Answer: 1

Explanation

Stateless Address Autoconfiguration (SLAAC) allows IPv6 hosts to configure addresses automatically using information provided by Router Advertisement messages. The router advertises an IPv6 prefix, and the host uses that prefix to construct an address. SLAAC can simplify IPv6 deployments because hosts do not need to receive every addressing detail manually. ARP is associated with IPv4 address resolution, NAT is primarily associated with IPv4 address translation, and DHCP snooping is a Layer 2 security feature. Proper IPv6 routing and Router Advertisement configuration are important for SLAAC to function correctly.