多选题Which two statements are true by default of a multilevel IS-IS network?（）ALevel 1 only routers see routes contained in their area.BLevel 1 routers route towards Level 2 routers due to the attached bit.CLevel 2 routers route towards Level 1 routers due

Routers A and B are connected with a point-to-point OC-3 interface. Each routers OC-3 interface is configured for both Level 1 and Level 2. The routers are configured in different areas. How many IS-IS adjacencies exist between the two routers?（）

A.0

B.1

C.2

D.3

A. Routers cannot redistribute external routes into the area.

B. Routers should have zero Type 3 LSAs in their LSDBs.

C. Routers should have zero Type 5 LSAs in their LSDBs.

D. Routers should learn default routes from the ABRs attached to the area.

A. IGP routes advertised by P routers

B. IGP routes advertised by PE routers

C. VPN routes advertised by PE routers

D. VPN routes advertised by CE routers

The relevant configuration files for the TestKing1 and TestKing2 routers are displayed below:With due consideration to the command outputs, which of the following reasons would you attribute the connectivity problem between the two routers?（）

A. The authentication needs to be changed to PAP for both routers.

B. The serial IP addresses of routers are not on the same subnet.

C. The username/password combination is incorrectly configured.

D. The router names are incorrectly configured.

Refer to the exhibit. The Route.com company is running EIGRP between all the r outers. Currently, if one of the LAN links (LAN1 or LAN2) at the headquarters flaps (goes up and down), the HQRTR1 and HQ - RTR2 routers will experience high CPU usage and have a long EIGRP convergence time. As the new network administrator, you are asked to investigate this situation and determine if there is a quick way to resolve this issue. Which is the most important thing that you can quickly verify first to resolve this issue?（）

A. Verify that the bandwidth setting on all WAN links is correct.

B. Verify that the HQ - RTR1 and HQ - RTR2 routers are configured to send only a default route to all the spoke routers.

C. Verify that the HQ - RTR1 and HQ - RTR2 routers are configured for EIGRP Nonstop Forwarding.

D. Verify that all the spoke routers are co nfigured for autosummarization.

E. Verify that all the spoke routers are configured as EIGRP stub.

A. Routers maintain a single link-state database per area.

B. Routers maintain a separate Level 1 link-state database.

C. Routers maintain a separate Level 2 link-state database.

D. Routers maintain a single Level 1 link-state database across multiple areas.

A. IS - IS is capable of supporting IPv4 and IPv6.

B. IS - IS is only capable of supporting IPv4 and CLNS.

C. IS - IS routers use ES - IS hellos (ESH) to establish and to maintain neighbor relationships.

D. IS - IS routers run the Bellman - Ford algorithm against their LSDBs to pick the best paths.

E. Level 1 routers learn about paths within the area of which they are a part.

F. Level 2 routers learn about paths both within areas and between areas.

Routers A and B are connected with a point-to-point OC-3 interface. Each router‘s OC-3 interface is configured for both Level 1 and Level 2. The routers are configured in the same area.How many IS-IS adjacencies exist between the two routers?（）

A.0

B.1

C.2

D.3

A.Interfaces have a default metric of 1.

B.Level 1 is intra - area and level 2 is interarea.

C.Level 1 routing is between an end system (ES) and IS while Level 2 routing is between an IS and IS.

D. Hosts send ISHs while routers send ESHs.

E. IS - IS is an open standard.

F. Metrics depend on interface speed.

A. A hub router prevents routes from being advertised to the remote router.

B. Only remote routers are configured as stubs.

C. Stub routers are not queried for routes.

D. Spoke routers connected to hub routers answer the route queries for the stub router.

E. A stub router should have only EIGRP hub routers as neighbors.

F. EIGRP stub routing should be used on hub routers only.