XZ company requires to build its network based on the modular enterprise network architecture. XZ has one R&D base in Shenzhen and Xi'an each; one office building in Beijing and Shanghai each; offices with more than 50 people in 23 capital cities; small offices with no more than 8 people in 200 small and medium-sized cities; There are usually more than 200 market and technical personnel on business trips at any given time. XZ Company strictly prohibits employees from using the company network to access websites that are not related to work. According to these circumstances, the network module XZ company should have is ________.

In the IS-IS network as shown in the figure, the verification part of each router is configured as follows:
RTA-Serial2/0]isis authentication-mode md5 h3c
RTB-isis-1]area-authentication-mode md5 h3c
RTC-isis-1]domain-authentication-mode md5 h3c
Then on RTB, the status of the RTA neighbor relationship is ______; and RTC______RTB Level-1 LSP packets

Which of the following statements about address prefix lists is incorrect is _______.

As shown in the figure, the MSR router at the headquarters is connected to the branch through two 100Mbps Ethernet links. To make full use of the existing bandwidth resources, which of the following routing schemes is the best?

The networking is as shown in the figure, eBGP runs between AS 100, AS 200, and AS 300, and ATM links between RTC and RTA, and RTC and RTB are connected. 2M line as backup, how to implement it on RTC?