After configuring RIPng on two routers that are connected via a WAN link, a network engineer notices that the two routers cannot exchange routing updates.
What is the reason for this?

A. Either a firewall between the two routers or an ACL on the router is blocking TCP 521.

B. Either a firewall between the two routers or an ACL on the router is blocking UDP 520.

C. Either a firewall between the two routers or an ACL on the router is blocking UDP 521.

D. Either a firewall between the two routers or an ACL on the router is blocking TCP 520. C








 

Suggested Answer: Explanation

RIPng is a UDP-based protocol.  Each router that uses RIPng has a routing process that sends and receives datagrams on UDP port number 521, the RIPng port.
Reference:
https://tools.ietf.org/html/rfc2080

This question is in 300-101 Cisco Implementing Cisco IP Routing (ROUTE) Exam
For getting Cisco Certified Network Professional (CCNP) Routing and Switching Certificate




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