IBGP was established on two Between directly connected devices of neighbors, if the shutdown command is executed to shut down the interface of one of the devices, the BGP connection will not be disconnected immediately.

• A. TRUE
• B. FALSE

Which of the following descriptions about link-state routing protocols is correct without dividing areas?

• A. Routers in a flood domain may receive the same link state information repeatedly
• B. Each router establishes a topology of the entire flooding domain
• C. The router will send all link state information from one neighbor to all other neighbors to ensure the synchronization of the database
• D. Routers throughout the flood domain have the same link-state database
• E. Each router learns routing entries directly from routing updates and adds them to the routing table

There is a network consisting of router R1, router R2, router R3 and router R4. The 4 routers are interconnected through a LAN network. All 4 routers have basic oSPF deployed. When you execute the command "display ospf peer" on the router R2, find the router R2 and the route

• A. router there is no full adjacency between R2 and router R3
  routerR4 is DR
• B. Router R2 is DR or BDR
• C. device the state between R3 is "2-way". So what can you conclude from this output?
  Router R2 is not a DR
• D. Router R3 is not a DR, nor a BDR

For the description of the firewall security zone, which of the following statements is correct? (single choice)

• A. Different security zones of the firewall can have the same priority
• B. Different interfaces of the waterproof wall can belong to the same security area
• C. The same interface of the firewall can belong to different security zones
• D. The firewall's own security zone can be deleted

General VPUsers in N can only communicate with each other, but cannot communicate with Internet users, nor can they access the Internet. However, each site of the VPN may need to access the Internet. Which is the correct description for the realization method of VPN and Internet interconnection?

• A. Implemented on the user side, directlyCEs are connected to the Internet. Each user site can be independently connected to the Internet, that is, the CE of each site is configured with a default route to the Internet.
• B. Implemented on the PE, the PE device is directed toThe CE sends a default route to the Internet and adds a default route to the Internet gateway in the VPN instance routing table.
• C. The implementation on PE is complicated and there are security risks. PE equipment may be affected by the Internet Dos attack.
• D. Implemented on the user side, the implementation method is simple, the public network and private network routes are isolated, and it is safe and reliable.