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Question 321. What does a VRF provide?

1. PoE redundancy
2. RF optimization
3. Separate routing tables
4. VLAN tagging

Correct Answer: 3. Separate routing tables

Explanation:

A Virtual Routing and Forwarding instance allows one physical switch to maintain logically separate routing tables. Interfaces assigned to different VRFs can therefore have independent routes and forwarding decisions even though they exist on the same device. This is useful for separating management traffic, tenants, departments, or other network functions. AOS-CX supports commands that display IPv4 and IPv6 routing information for individual VRFs. VRFs provide Layer 3 separation and are different from VLANs, which primarily create Layer 2 broadcast domains.

Question 322. Which command shows routes in one VRF?

1. show ip route vrf
2. show vlan
3. show lacp
4. show poe

Correct Answer: 1. show ip route vrf

Explanation:

The show ip route vrf <vrf-name> command displays IPv4 routes selected for forwarding within a specified VRF. The output can show connected, local, static, and other route types depending on the configuration. This is particularly useful when troubleshooting a device containing several VRFs because each VRF can have a different forwarding table. Looking only at the default routing table could cause an administrator to miss a route that exists in another VRF or incorrectly conclude that a route is absent.

Question 323. Where does a static route go if no VRF is specified?

1. Management VRF
2. First custom VRF
3. All VRFs
4. Default VRF

Correct Answer: 4. Default VRF

Explanation:

AOS-CX places a static IPv4 route into the default VRF when no explicit VRF name is included in the route command. If the administrator wants the route installed in another routing instance, the VRF must be specified. This matters because routes are isolated by VRF; a static route added to the default VRF does not automatically appear in another custom VRF. When troubleshooting, administrators should always verify both the destination prefix and the routing context in which the route was configured.

Question 324. What type is a loopback interface?

1. Layer 1
2. Layer 3
3. Layer 2 only
4. Wireless

Correct Answer: 2. Layer 3

Explanation:

An AOS-CX loopback interface is a logical Layer 3 interface. It is not tied directly to one physical switch port, making it useful as a stable IP endpoint for routing, management, or protocol identification. HPE supports creating loopback interfaces with the interface loopback command on supported platforms. Because a loopback’s logical state is less dependent on an individual physical connection than a normal routed port, it is often chosen for stable router IDs, management source addresses, and similar infrastructure functions.

Question 325. Why use a source interface?

1. Keep a consistent source IP
2. Increase PoE power
3. Change VLAN IDs
4. Increase MTU

Correct Answer: 1. Keep a consistent source IP

Explanation:

A source-interface setting forces selected management or service traffic to use a predictable source address or interface. This is helpful when a switch has several routed interfaces or VRFs. A stable source IP simplifies firewall rules, RADIUS configuration, TACACS policies, syslog collectors, NTP servers, and management-system allowlists. AOS-CX supports source-interface configuration for services including Central, DNS, NTP, RADIUS, TACACS, syslog, sFlow, TFTP, and SSH client traffic.

Question 326. Which service supports source-interface selection?

1. STP only
2. PoE only
3. RADIUS
4. VLAN tagging only

Correct Answer: 3. RADIUS

Explanation:

RADIUS is one of the protocols for which AOS-CX supports explicit source-interface selection. Administrators can choose either a specific interface or source IP address and can associate the selection with a particular VRF. This is useful when the RADIUS server expects authentication requests from a known source address. AOS-CX also supports source selection for protocols such as TACACS, NTP, DNS, syslog, TFTP, Central, sFlow, and SSH client sessions. The feature improves predictability of management-plane communication.

Question 327. Which command checks source-interface settings?

1. show spanning-tree
2. show poe
3. show vlan
4. show ip source-interface

Correct Answer: 4. show ip source-interface

Explanation:

The show ip source-interface command displays the configured source-interface information for supported protocols. Administrators can check a specific VRF or all VRFs and can display settings for protocols such as Central, RADIUS, TACACS, DNS, NTP, syslog, sFlow, and others. This is useful when a management service is reachable but rejects requests because they originate from an unexpected source address. Verifying source selection helps distinguish connectivity problems from source-address or VRF configuration problems.

Question 328. What does routing enable on an interface?

1. PoE
2. Layer 3 operation
3. WLAN service
4. STP edge mode

Correct Answer: 2. Layer 3 operation

Explanation:

The AOS-CX routing command enables routing on a physical interface, turning it into a Layer 3 interface capable of carrying IPv4 or IPv6 addresses and forwarding routed traffic. The opposite command, no routing, changes the interface into a Layer 2 interface. Platform defaults can differ, so administrators should verify the current interface configuration rather than assuming every port starts in the same mode. Routed ports are commonly used for point-to-point links between switches or routers where VLAN switching is unnecessary.

Question 329. What does no routing create?

1. Loopback interface
2. VRF
3. OSPF process
4. Layer 2 interface

Correct Answer: 4. Layer 2 interface

Explanation:

The no routing command disables Layer 3 routing support on an interface and makes it operate as a Layer 2 interface. Once in Layer 2 mode, the port can be configured for access or trunk VLAN behavior as required. HPE’s interface configuration documentation specifically uses no routing when preparing physical ports for Layer 2 service. This command does not create a loopback, VRF, or OSPF process. It changes the forwarding role of the interface from routed to switched operation.

Question 330. What does interface MTU define?

1. Maximum Layer 2 frame size
2. OSPF cost
3. PoE budget
4. RADIUS timeout

Correct Answer: 1. Maximum Layer 2 frame size

Explanation:

The interface MTU defines the maximum Layer 2 Ethernet frame size accepted for normal forwarding on that interface. HPE documents a default MTU of 1500 bytes on the cited AOS-CX platforms, with larger values available when jumbo-frame support is required. Frames exceeding the configured MTU can be dropped. Administrators should ensure devices across a path use compatible MTU settings because inconsistent values can cause application or protocol problems, especially when larger frames are used.

Question 331. What is the default interface MTU cited for AOS-CX?

1. 576
2. 9000
3. 1500
4. 9216

Correct Answer: 3. 1500

Explanation:

HPE documents a default interface MTU value of 1500 bytes on the cited AOS-CX platforms. Networks requiring jumbo frames must explicitly increase the MTU where supported. HPE documents support for Layer 2 MTU values up to 9198 bytes on several switch families. When changing MTU, administrators should consider the complete end-to-end path because one smaller-MTU link can still prevent large frames from traversing successfully. Standard 1500-byte MTU remains appropriate for many ordinary campus Ethernet deployments.

Question 332. What is required for jumbo frames?

1. Lower MTU
2. Increased MTU
3. Lower PoE priority
4. RADIUS authentication

Correct Answer: 2. Increased MTU

Explanation:

Jumbo frames are Ethernet frames larger than the normal standard frame size, so interfaces carrying them need an appropriately increased MTU. HPE states that the interface MTU should be increased when frames larger than 1522 bytes must be supported and documents values up to 9198 bytes on supported platforms. MTU planning must be consistent along the path because a smaller setting on one interface can still cause oversized frames to be dropped. Jumbo frames are unrelated to PoE or authentication settings.

Question 333. What does IP MTU define?

1. Largest IP packet size
2. Maximum MAC entries
3. VLAN range
4. PoE wattage

Correct Answer: 1. Largest IP packet size

Explanation:

The IP MTU specifies the largest IP packet that an interface can send or receive. HPE documents a default IP MTU of 1500 bytes in the cited AOS-CX Fundamentals Guide. The IP MTU must be less than or equal to the interface’s overall MTU because the Layer 3 packet must fit within the Layer 2 frame. Distinguishing the interface MTU from the IP MTU is useful when troubleshooting oversized packets, fragmentation behavior, or applications that fail only when sending larger payloads.

Question 334. Which command gives a short interface summary?

1. show radius
2. show ntp
3. show arp
4. show interface brief

Correct Answer: 4. show interface brief

Explanation:

The show interface brief form provides a compact tabular summary of interface status instead of the much more detailed statistics displayed by the full show interface output. This is useful when an administrator wants to scan many ports quickly and identify which interfaces are operational or need additional investigation. AOS-CX also provides physical, extended, monitor, and human-readable interface views depending on the troubleshooting requirement. The brief view is therefore a good first step for broad interface-state checks.

Question 335. What does show ip interface display?

1. WLAN clients
2. PoE statistics
3. Layer 3 interface details
4. Firmware history

Correct Answer: 3. Layer 3 interface details

Explanation:

The show ip interface command displays IPv4 Layer 3 information for the selected interface. HPE examples show details such as administrative and operational state, IP MTU, TCP MSS, IPv4 address, hardware information, and Layer 3 packet counters. This makes the command useful when an interface is physically up but IP communication still fails. Administrators can verify whether the intended address, mask, and Layer 3 state are actually present before investigating routing or application behavior.

Question 336. Why use multiple VRFs?

1. Increase PoE capacity
2. Isolate Layer 3 networks
3. Increase RF channels
4. Create LAG members

Correct Answer: 2. Isolate Layer 3 networks

Explanation:

Multiple VRFs allow one switch to support separate logical routing domains. Each VRF can contain its own connected, local, static, and dynamic routes without automatically sharing them with other VRFs. This can separate management, tenants, departments, or services even when they use the same physical switch. HPE’s routing commands explicitly allow administrators to inspect routes per VRF and configure static routes into selected VRFs. Route leaking can be configured when controlled communication between routing domains is required.

Question 337. What does ip route … vrf red do?

1. Creates VLAN red
2. Adds a DNS server
3. Changes port speed
4. Adds a route to VRF red

Correct Answer: 4. Adds a route to VRF red

Explanation:

Adding vrf red to an AOS-CX static route command installs the route in the routing table associated with the VRF named red. Without the VRF keyword, the route normally belongs to the default VRF. This separation ensures that traffic in one routing domain does not automatically use routes belonging to another. HPE supports next-hop IP addresses, outgoing interfaces, reject routes, and null routes within the static route syntax depending on the platform and requirement.

Question 338. Why use a loopback for management sourcing?

1. More PoE power
2. Stable logical address
3. More VLANs
4. Faster Wi-Fi

Correct Answer: 2. Stable logical address

Explanation:

A loopback provides a stable logical Layer 3 interface that is not directly tied to the operational state of one physical port. This makes it a useful source address for management protocols and monitoring systems when routing provides reachability to the loopback. If one physical path fails and another remains available, the loopback address can still be reachable. HPE specifically recommends loopback interfaces as SNMP response sources where supported, reflecting the operational advantage of using a predictable, stable management address.

Question 339. What source does HPE recommend for SNMP responses?

1. Loopback interface
2. Random access port
3. Native VLAN only
4. PoE port

Correct Answer: 1. Loopback interface

Explanation:

HPE recommends using a loopback interface, or its IP address, as the SNMP response source when the device supports loopbacks. If loopbacks are unavailable, HPE recommends using an SVI as an alternative. A stable response source helps monitoring systems identify the device consistently and simplifies management ACLs and collector configuration. HPE also notes that the selected source interface should be operational; otherwise, the switch may fall back to its default source IP behavior.

Question 340. Which design BEST separates management traffic?

1. One VLAN for everything
2. Random source addresses
3. Management VRF with stable source interfaces
4. Disable routing

Correct Answer: 3. Management VRF with stable source interfaces

Explanation:

A dedicated management VRF creates a separate routing domain for administrative traffic, reducing interaction with ordinary production forwarding. Stable source-interface settings—preferably using a suitable loopback or dedicated management interface where supported—give management services predictable source addresses. This simplifies AAA, syslog, SNMP, NTP, and firewall policies while improving operational clarity. AOS-CX supports VRF-aware routes and source-interface selection for many management protocols. Combining those functions provides stronger management-plane separation than placing all services into one unrestricted routing domain.