HPE6-A89 Sample Questions & Answers

An access port is used for connecting end devices. It belongs to a single VLAN and transmits frames for that VLAN untagged. Trunk ports carry traffic for multiple VLANs and are used for switch-to-switch links. Hybrid ports are a flexible combination of access and trunk features.

On HPE Comware devices, enabling IGMP snooping is a two-step process. It must first be enabled globally using igmp-snooping. Then, it must be enabled on a per-VLAN basis within the VLAN interface view (e.g., vlan 100 followed by igmp-snooping enable). Forgetting the per-VLAN command is a common error that causes the switch to flood multicast traffic within that specific VLAN, defeating the purpose of snooping.

Ansible gathers 'facts' about managed nodes, including the network operating system. For HPE Comware devices, the ansible_network_os fact is populated with the value 'hpe.comware.comware'. Using a when conditional to check this fact is the most reliable and standard way to ensure a task runs only on the intended platform, regardless of the device's hostname or group membership.

A 'totally stubby' area is the most restrictive. It blocks both Type 5 (external) and Type 3 (inter-area summary) LSAs from entering the area. The ABR automatically injects a single Type 3 LSA representing a default route. This provides maximum routing table reduction for the internal routers of that area. A regular 'stub' area only blocks Type 5 LSAs but allows Type 3s.

HPE Comware uses 'preference' (equivalent to administrative distance) to determine the trustworthiness of a routing source. OSPF has a default preference of 10, while a static route has a default preference of 60. The route with the lowest preference value is considered more reliable and is installed in the forwarding table. Therefore, the OSPF route will be preferred.

Intelligent Resilient Framework (IRF) allows multiple physical switches to be virtualized into a single logical device. This provides a single management IP, simplifies the topology, and allows for the use of cross-switch link aggregation (LACP). This active-active link aggregation from downstream devices effectively eliminates the need for STP to block links for loop prevention between the core switches.

PIM Sparse Mode is designed for scenarios where receivers are few and widely dispersed. It uses an explicit join model where traffic is only sent to segments of the network that have active receivers. This is much more efficient than PIM Dense Mode, which uses a flood-and-prune model that initially floods traffic everywhere and is better suited for networks with a high density of receivers.

The iBGP split-horizon rule states that a route learned from an iBGP peer cannot be advertised to another iBGP peer. To overcome this, all iBGP speakers in an AS must form a full mesh of peerings, which is not scalable. A route reflector (RR) is a central point that can reflect routes learned from one iBGP peer (its client) to other iBGP peers (other clients), thus eliminating the need for a full mesh.

In standard RESTful API design, the POST method is used to create a new resource (like a new VLAN). The PUT method is used to update or replace an existing resource in its entirety (like changing the VLAN's attributes, including its description). GET is for retrieving data, and DELETE is for removing a resource.

Links that connect different MSTP regions are known as boundary links. The forwarding state of these links is not determined by the individual MSTIs (MST Instances) within each region. Instead, their state is managed by the CIST, which provides a single, loop-free topology across all interconnected regions. The MSTIs operate independently within the boundaries of their respective regions.