Which difference must an engineer consider when choosing whether to implement OSPF or IS-IS as the routing protocol on the network?

Refer to the exhibit. IS-IS is the IGP for the network, where routers R1, R2, R3, and R4 are Level
1 routers in Area 12 and routers R5 and R6 are Level 2 routers in area 16. According to the network design, router R1 must send traffic to R6 using R4 as its next hop. To meet the requirement, a network engineer configured route filtering on R2 to prevent the route to R6 from being advertised from R2. However, R1 is still using R2 as the next hop. Which action must the engineer take to resolve the issue?

What is a key benefit of BGP dynamic update peer groups?

Refer to the exhibit. An engineering team implemented IS-IS on the network, with several different areas. Recently, router R6 in area 3 has been experiencing excessive CPU usage. To reduce the load, a network engineer implemented route summarization on R2 However, R6 is still receiving the full routes from all routers.
Which action must the engineer take to resolve the excessive CPU usage?

Refer to the exhibit.

After you applied these configurations to routers R1 and R2, the two devices could not form a neighbor relationship. Which reason for the problem is the most likely?