Pass the HP Aruba Certified Switching Expert HPE7-A08 Questions and answers with CertsForce

When User-Based Tunneling (UBT) is configured and HTTPS-enabled websites fail to load, this often relates to issues with packet fragmentation. The solution is to enable IP fragmentation on the devices to allow large tunneled packets to be properly fragmented and reassembled.

Path MTU discovery is helpful but may be blocked in some networks.

Fragment reassembly is usually on the receiving end.

Jumbo frames may not resolve fragmentation across tunneled paths.

Therefore, enabling IP fragmentation is the most effective solution.

To implement Dynamic User Roles (DUR) with Aruba ClearPass, an HTTPS certificate must be configured. This certificate enables secure communication between ClearPass and the Aruba CX switches for role downloading and authentication.

RadSec service enables secure RADIUS but is unrelated to DUR certificates.

Admin user roles and RADIUS dictionary attributes are necessary but secondary to certificate requirements.

Backing up the switch configuration to a remote Linux SFTP server requires using the copy command with the correct protocol (SFTP in this case), username, server IP, filename, and optionally the VRF to route management traffic.

Option A uses SCP and vrf default but the question mentions SFTP server, so SFTP protocol should be used.

Option B is a server-side command (not the switch).

Option C correctly uses copy startup-config sftp://user@192.168.1.100/switch_config.cfg vrf mgmt which backs up the startup-config via SFTP using the management VRF.

Option D is also a server-side command.

Using vrf mgmt is required because the management IP is in a separate VRF on CX switches.

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When creating a device profile for an AP (Access Point) on Aruba CX switches, two essential configuration tasks include:

Associating a role (Option A): This assigns specific permissions and access levels to the AP.

Associating an LLDP group (Option C): LLDP groups define the LLDP settings for the AP, critical for device discovery and network management.

Other options like QoS policy, VLAN, or ACL associations are typically handled separately or at the VLAN or policy level.

If the ISL between two VSX core switches is down and logs indicate that Core-2 has disabled its VSX LAG interfaces, it means Core-2 has disabled its VSX LAG interfaces, likely as a protective or failover mechanism.

Keepalive packets being dropped (Option B) may cause issues but logs specifically state interface disablement.

Both switches forwarding traffic (Option C) is unlikely if ISL is down.

Downstream switches inability to forward traffic (Option D) is a consequence, not the cause.

To keep the BGP routing table size manageable and below a specified threshold, the customer should consider enforcing routing policies with aggregation. Route aggregation reduces the number of individual routes advertised and stored by combining multiple routes into a summarized one.

Setting route metrics equal or advertising only a primary path does not reduce the number of routes as effectively.

Importing only the default route (0.0.0.0/0) is impractical for normal operations.

Thus, route aggregation is the best practice for controlling routing table size in merged BGP environments.

The configuration involves connecting two buildings over fiber using OM4 cabling with a distance of 200 meters. The current optics in use are 25GR (25 Gigabit Rate) optics.

For multimode fiber such as OM4, SR (Short Reach) optics are suitable for distances up to 300 meters. In contrast, LR (Long Reach) optics are typically designed for single-mode fiber and longer distances.

Therefore, to properly support the 200m OM4 fiber link, 25SR optics should be used instead of 25GR (which are often long-reach optics).

10SR and 10LR refer to 10Gbps optics, which do not meet the 25Gbps requirement.

25LR optics are for single-mode fiber and longer distances, not multimode.

In VSX architecture, the Inter-Switch Link (ISL) is implemented as a Link Aggregation Group (LAG). To ensure proper forwarding and VLAN consistency, the ISL LAG must allow all configured VLANs. This allows VSX synchronization and data forwarding across all VLANs that span the two switches.

ISL traffic is not specifically tagged with EF QoS markings by default.

ISL traffic is not encapsulated in GRE tunnels.

The ISL LAG does not automatically include all VLANs; VLANs must be allowed on the LAG explicitly.

Hence, the LAG must be configured to allow all VLANs.

This question involves OSPF peering configured between CX 6300 switches using BFD (Bidirectional Forwarding Detection). BFD parameters include transmit (Tx) and receive (Rx) intervals.

Switch B has custom BFD interval values configured, but switch A is at default configuration.

According to Aruba CX default BFD parameters, the Tx and Rx intervals default to 2000ms (2 seconds). This is why switch A’s show BFD session displays intervals of 2000ms even if switch B uses different values.

BFD interval negotiation results in the highest Tx/Rx interval being used, or default in case one side is unconfigured.