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Question 301

Which Aruba CX feature allows administrators to combine multiple physical links into one logical interface for increased resiliency?

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

Correct Answer: 3

Explanation

Link Aggregation Group (LAG) combines multiple physical Ethernet interfaces into a single logical interface. This can provide redundancy because traffic can continue using remaining member links if one physical connection fails. It can also provide additional aggregate bandwidth when traffic is distributed across multiple links. LAGs are commonly used between switches or between a switch and a server. LACP can be used to dynamically negotiate and maintain the aggregation. Administrators should ensure that the participating interfaces have compatible configurations so that the logical aggregation operates correctly.

Question 302

Which command is commonly used to display the VLAN configuration on an Aruba CX switch?

1. show vlan
2. show ip route
3. show lldp neighbors
4. show ntp status

Correct Answer: 1

Explanation

The show vlan command provides information about VLANs configured on an Aruba CX switch. It can help administrators verify VLAN IDs, names, and associated ports or interfaces. This makes it useful when troubleshooting connectivity problems related to VLAN membership or segmentation. show ip route focuses on routing information, show lldp neighbors displays directly connected neighbors, and show ntp status provides time-synchronization information. Checking VLAN configuration is often an important first step when a device cannot communicate with other hosts in the expected broadcast domain.

Question 303

Which protocol is primarily responsible for exchanging link-state routing information within an autonomous system?

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

Correct Answer: 3

Explanation

OSPF is a link-state interior gateway protocol designed to exchange routing information within an autonomous system. Routers running OSPF build a topology database and use that information to calculate shortest paths to destinations. OSPF supports hierarchical designs through areas, with Area 0 serving as the backbone area in conventional deployments. BGP is primarily used for interdomain routing and policy-based route exchange, DHCP provides host configuration, and RADIUS supports authentication. OSPF is commonly used in enterprise networks where dynamic internal routing is required.

Question 304

What is the primary purpose of a DHCP relay agent?

1. To encrypt DHCP packets
2. To forward DHCP requests between different IP subnets
3. To assign MAC addresses
4. To prevent Layer 2 loops

Correct Answer: 2

Explanation

A DHCP relay agent forwards DHCP messages between clients and DHCP servers located on different IP subnets. DHCP clients initially use broadcast communication, and routers normally do not forward these broadcasts. A relay agent receives the request and forwards it toward the DHCP server, allowing centralized DHCP services to support multiple subnets. DHCP relay does not encrypt the DHCP communication, assign MAC addresses, or prevent Layer 2 loops. Proper relay configuration can significantly simplify enterprise IP address management by allowing one or more centralized DHCP servers to serve many network segments.

Question 305

Which Aruba CX capability can provide event-driven monitoring and automated analysis of switch conditions?

1. NAE
2. NAT
3. VRRP
4. FTP

Correct Answer: 1

Explanation

The Network Analytics Engine (NAE) is an Aruba CX capability designed to provide monitoring and analytics directly on supported switches. NAE agents can monitor selected conditions, analyze operational information, and generate alerts when defined events or thresholds occur. This can help administrators identify problems more quickly than relying exclusively on manual command-line checks. NAT translates addresses, VRRP provides gateway redundancy, and FTP is a file-transfer protocol. NAE is especially useful for proactive troubleshooting because it can continuously observe selected aspects of switch operation.

Question 306

Which protocol is commonly used to authenticate network administrators against a centralized authentication server?

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

Correct Answer: 2

Explanation

RADIUS is commonly used for centralized authentication, authorization, and accounting services. Network devices can communicate with a RADIUS server when users attempt to access management services or, in appropriate deployments, network access. Centralizing authentication can simplify administration because user credentials and access policies can be managed through a dedicated authentication infrastructure. OSPF handles routing, LLDP discovers neighboring devices, and LACP manages link aggregation. RADIUS can therefore help organizations apply consistent authentication policies across multiple network devices instead of maintaining independent local accounts everywhere.

Question 307

Which IPv4 mechanism translates private addresses into a public address for Internet communication?

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

Correct Answer: 1

Explanation

Network Address Translation (NAT) translates IP addresses between different addressing domains. A common use is translating private IPv4 addresses used by internal hosts into one or more public IPv4 addresses when accessing external networks. NAT can conserve public IPv4 address space and hide internal addressing details from external networks. STP prevents Layer 2 loops, LLDP provides neighbor discovery, and NTP synchronizes clocks. Although NAT can provide useful address translation, it should not automatically be considered a complete security mechanism because additional firewall and access-control policies may still be required.

Question 308

Which protocol is designed to synchronize clocks across network devices?

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

Correct Answer: 3

Explanation

Network Time Protocol (NTP) synchronizes the clocks of network devices and other systems. Accurate time is important for troubleshooting, log correlation, authentication mechanisms, certificates, and security monitoring. A network can use one or more reliable time sources, while clients synchronize their clocks with configured NTP servers. SNMP is used for network management, DHCP provides configuration information, and BGP exchanges routing information. Maintaining consistent time across switches, routers, servers, and monitoring systems makes it easier to correlate events and determine the sequence in which network problems occurred.

Question 309

Which switching port type normally carries traffic for a single VLAN without VLAN tagging toward an end host?

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

Correct Answer: 2

Explanation

An access port is normally associated with a single VLAN and is commonly used to connect end devices such as workstations, printers, or similar hosts. Frames sent toward the end device are generally transmitted without an 802.1Q VLAN tag in a typical access-port configuration. A trunk can carry multiple VLANs, a routed port operates at Layer 3 rather than acting as a traditional VLAN access port, and a mirror port is associated with traffic monitoring. Correct access VLAN configuration is essential for ensuring that connected devices are placed in the intended broadcast domain.

Question 310

Which routing-table principle determines that the most specific matching route should be selected?

1. Administrative distance
2. Longest prefix match
3. Round-robin forwarding
4. MAC address learning

Correct Answer: 2

Explanation

Longest prefix match means that when multiple routes match a destination address, the route with the most specific prefix is preferred. 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 providing more precise paths for specific networks. Administrative distance can influence which routing source is preferred when routes are otherwise comparable, while MAC address learning is a Layer 2 switching function. Understanding longest prefix matching is essential for troubleshooting unexpected routing decisions.

Question 311

Which security feature can help prevent unauthorized DHCP servers from responding to clients?

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

Correct Answer: 1

Explanation

DHCP snooping can help protect a network from unauthorized DHCP servers by distinguishing trusted and untrusted switch interfaces. DHCP server responses are normally expected to arrive through trusted interfaces, while client-facing interfaces can be treated as untrusted. This helps prevent a rogue DHCP server from distributing incorrect gateways, DNS information, or IP addresses to clients. VRRP provides gateway redundancy, OSPF provides dynamic routing, and sFlow provides traffic monitoring. DHCP snooping can also create binding information that may be used by other security mechanisms.

Question 312

Which technology is commonly used to discover the identity and capabilities of directly connected network devices?

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

Correct Answer: 3

Explanation

Link Layer Discovery Protocol (LLDP) allows network devices to advertise information about themselves to directly connected neighbors. Depending on the implementation and configuration, information can include device identity, interface information, system capabilities, and management details. Administrators can use LLDP to understand physical topology and verify that devices are connected to expected interfaces. NAT performs address translation, DHCP provides host configuration, and VRRP provides gateway redundancy. LLDP is especially useful when troubleshooting cabling or documenting a network because it can reveal neighboring-device information directly from switch interfaces.

Question 313

Which BGP attribute is commonly used to influence the preferred outbound path within an autonomous system?

1. MED
2. Local Preference
3. Origin
4. Next Hop

Correct Answer: 2

Explanation

The BGP Local Preference attribute is commonly used within an autonomous system to influence which outbound path is preferred. A higher local preference is generally preferred when comparing applicable BGP routes. This makes the attribute useful for controlling how routers within the same autonomous system select exits toward external destinations. MED can influence how neighboring autonomous systems may prefer entry paths, while Origin and Next Hop serve different roles in BGP route selection and forwarding. Administrators should understand the scope of each BGP attribute before using it in routing policy.

Question 314

Which IPv6 protocol replaces ARP for discovering the Layer 2 address associated with an IPv6 neighbor?

1. DHCPv4
2. NDP
3. RADIUS
4. STP

Correct Answer: 2

Explanation

IPv6 uses Neighbor Discovery Protocol (NDP), which operates through ICMPv6, for functions that include discovering neighboring devices and resolving IPv6 addresses to link-layer addresses. Unlike IPv4, IPv6 does not use ARP for this purpose. NDP also supports router discovery and related address-resolution functions. DHCPv4 is an IPv4 host-configuration protocol, RADIUS provides authentication services, and STP prevents Layer 2 loops. Understanding NDP is important when troubleshooting IPv6 connectivity because neighbor discovery failures can prevent hosts from communicating even when IPv6 addressing appears correctly configured.

Question 315

Which mechanism allows an Aruba CX switch to maintain a synchronized configuration between two peer switches in a VSX pair?

1. VSX
2. NAT
3. SNMP
4. DHCP

Correct Answer: 1

Explanation

VSX is an Aruba CX technology that allows two switches to operate as a redundant pair while providing coordinated behavior for supported features. VSX synchronization can help maintain consistent configuration information between the peer switches. The design can provide high availability and allow connected devices to use redundant paths without relying on a traditional Layer 2 loop. NAT translates addresses, SNMP provides management information, and DHCP provides IP configuration. Proper VSX design requires correct peer-link and keepalive configuration along with appropriate consideration of supported synchronization features.

Question 316

Which protocol is commonly used to export sampled traffic information to a monitoring collector?

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

Correct Answer: 3

Explanation

sFlow is designed to provide sampled traffic information to a monitoring or analysis system. Network devices collect samples and interface statistics and send them to an sFlow collector. The collector can then analyze traffic patterns, identify major traffic sources, monitor utilization, and support capacity planning. RADIUS handles authentication, OSPF provides dynamic routing, and VRRP provides redundant gateway functionality. Because sFlow uses sampling rather than capturing every packet, it can provide useful visibility with less processing and storage overhead than full packet capture.

Question 317

Which type of interface is used when an Aruba CX switch performs Layer 3 routing rather than traditional Layer 2 switching on the interface?

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

Correct Answer: 1

Explanation

A routed interface operates as a Layer 3 interface and can be assigned an IP address for routing traffic. Unlike a traditional access or trunk switch port, a routed interface is not primarily used to carry Layer 2 VLAN traffic. Routed interfaces are useful when connecting switches to routers, firewalls, or other Layer 3 devices. Access interfaces normally belong to a VLAN, trunk interfaces carry multiple VLANs, and mirror interfaces are used for traffic monitoring. Understanding the distinction between Layer 2 and Layer 3 interfaces is important when designing Aruba CX networks.

Question 318

Which redundancy protocol uses a virtual IP address that hosts can configure as their default gateway?

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

Correct Answer: 2

Explanation

VRRP provides gateway redundancy by allowing multiple routers to participate in a virtual router group. A virtual IP address represents the gateway, and hosts can use that address as their default gateway. One router normally performs the forwarding role while another can assume that role if the active router becomes unavailable. LACP aggregates physical links, LLDP provides neighbor discovery, and NTP synchronizes device clocks. Using a virtual gateway address helps prevent hosts from requiring manual reconfiguration when the physical router providing gateway service changes.

Question 319

Which feature can restrict ARP traffic by validating IP-to-MAC bindings learned from DHCP snooping?

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

Correct Answer: 1

Explanation

Dynamic ARP Protection can validate ARP packets against trusted IP-to-MAC binding information. When DHCP snooping is enabled, the switch can build bindings based on legitimate DHCP transactions. Dynamic ARP Protection can then use this information to identify ARP messages that do not correspond to expected bindings. This helps mitigate certain ARP spoofing and poisoning attacks. NTP synchronizes time, LACP manages aggregated links, and BGP exchanges routing information. These security features are particularly useful in Layer 2 environments where hosts share a broadcast domain.

Question 320

Which Aruba CX capability can provide centralized visibility into the health and status of managed network infrastructure?

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

Correct Answer: 3

Explanation

Aruba Central provides centralized visibility and management for supported Aruba networking infrastructure. Administrators can use the platform to monitor device health, review alerts and events, manage configurations, and obtain information about connected network resources. This centralized approach can simplify operations in environments containing many switches, access points, and other managed devices. ARP handles IPv4 address resolution, OSPF provides dynamic routing, and STP prevents Layer 2 loops. Centralized monitoring is especially useful when administrators need to identify network-wide issues without individually checking every device.