ACSP Routing Protocols & IP Addressing 4 — Questions and Answers
Question 1: Which IPv6 address type is equivalent to IPv4 private addresses and is routable only within the local site?
- Link-local (fe80::/10)
- Unique local (fc00::/7) (Correct answer)
- Global unicast (2000::/3)
- Multicast (ff00::/8)
Correct 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.
Question 2: On an ArubaOS-CX switch, which command displays the IPv6 routing table?
- show ipv6 route (Correct answer)
- show ip route ipv6
- show routing ipv6
- show ipv6 neighbors
Correct answer: show ipv6 route
The 'show ipv6 route' command displays the IPv6 unicast routing table on ArubaOS-CX.
Question 3: A /30 subnet is used for a point-to-point WAN link. How many usable host addresses does this subnet provide?
- 1
- 2 (Correct answer)
- 4
- 6
Correct answer: 2
A /30 subnet contains 4 total addresses: one network address, two usable hosts, and one broadcast.
Question 4: In ArubaOS-CX, what does the 'ip route 0.0.0.0/0 192.168.1.1' command configure?
- A summary route for all RFC 1918 addresses
- A static default route pointing to 192.168.1.1 (Correct answer)
- A floating static route with high administrative distance
- A host route for the address 0.0.0.0
Correct 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.
Question 5: Which OSPFv3 feature distinguishes it from OSPFv2 when operating in an IPv6 environment?
- OSPFv3 uses MD5 authentication natively in the protocol
- OSPFv3 runs per-link rather than per-subnet and uses link-local addresses for adjacency (Correct answer)
- OSPFv3 supports only stub areas
- OSPFv3 uses TCP instead of IP protocol 89
Correct 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.
Question 6: An ArubaOS-CX switch learns the same prefix via OSPF (AD 110) and RIP (AD 120). Which route is installed in the RIB?
- RIP route because it has a lower metric
- OSPF route because it has a lower administrative distance (Correct answer)
- Both routes are installed and traffic is load-balanced
- The route learned most recently is installed
Correct 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.
Question 7: What is the purpose of VRRP (Virtual Router Redundancy Protocol) on ArubaOS-CX switches?
- To synchronize routing tables between switches
- To provide a virtual default gateway that survives a single router failure (Correct answer)
- To load-balance traffic across multiple uplinks
- To authenticate OSPF neighbors between switches
Correct 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.
ACSP Routing Protocols & IP Addressing 4
Which IPv6 address type is equivalent to IPv4 private addresses and is routable only within the local site?