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Routing Protocols & IP Addressing Flashcards

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  1. Which IPv6 address type is equivalent to IPv4 private addresses and is routable only within the local site?

    Answer: Unique local (fc00::/7)

    IPv6 unique local addresses (fc00::/7, commonly fd00::/8) are the equivalent of IPv4 private address space, not routable on the global internet.

  2. On an ArubaOS-CX switch, which command displays the IPv6 routing table?

    Answer: show ipv6 route

    The 'show ipv6 route' command displays the IPv6 unicast routing table on ArubaOS-CX.

  3. A /30 subnet is used for a point-to-point WAN link. How many usable host addresses does this subnet provide?

    Answer: 2

    A /30 subnet contains 4 total addresses: one network address, two usable hosts, and one broadcast.

  4. In ArubaOS-CX, what does the 'ip route 0.0.0.0/0 192.168.1.1' command configure?

    Answer: A static default route pointing to 192.168.1.1

    A route to 0.0.0.0/0 is the default route, matching any destination when no more specific route exists, forwarded to the specified next-hop.

  5. Which OSPFv3 feature distinguishes it from OSPFv2 when operating in an IPv6 environment?

    Answer: OSPFv3 runs per-link rather than per-subnet and uses link-local addresses for adjacency

    OSPFv3 forms adjacencies using link-local addresses and operates on a per-link basis rather than per-subnet as in OSPFv2.

  6. An ArubaOS-CX switch learns the same prefix via OSPF (AD 110) and RIP (AD 120). Which route is installed in the RIB?

    Answer: OSPF route because it has a lower administrative distance

    Administrative distance is used to select between routes from different protocols; OSPF's AD of 110 is preferred over RIP's AD of 120.

  7. What is the purpose of VRRP (Virtual Router Redundancy Protocol) on ArubaOS-CX switches?

    Answer: To provide a virtual default gateway that survives a single router failure

    VRRP creates a virtual IP address shared between routers, providing default gateway redundancy so hosts continue forwarding traffic if one router fails.