Refer to the exhibit. A network engineer is in the process of implementing IS -IS Area 1 and Area 2 on this network to segregate traffic between different segments of the network. The hosts in the two

For hosts in IS-IS Area 1 to communicate with hosts in Area 2, inter-area routing is required. In IS-IS, this is achieved by configuring a router at the boundary between areas (in this case, R3 or R4) as an L1L2 router, which can exchange routes between Level 1 (intra-area) and Level 2 (inter-area) domains.

Configuring all perimeter routers (R1, R2, R5, R6) as L1L2 routers is excessive and unnecessary; only the boundary routers between the areas need this capability for inter-area communication.

Routers R2 and R5 are typically internal to their respective areas and not directly connecting Area 1 and Area 2; therefore, making them L1L2 routers would not facilitate the required inter-area communication.

Reconfiguring R4, R5, and R6 as Level 1 routers would restrict them to only intra-area routing within Area 2, preventing any communication with Area 1.