What is the reason for this?

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?

Question:

What is the reason for this?

Options:

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

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

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

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

Correct Answer

The Correct Answer for this Question is

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

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