Which of the following descriptions of multicast routing is correct? (Multiple choice)

• A.Multicast routing protocols are divided into intra-domain multicast routing protocols and inter-domain multicast routing protocols.
• B.Multicast routing protocols include IGMP protocol
• C.Multicast routing forms a one-way loop-free data transmission path from the data source to multiple receivers, that is, the multicast distribution tree
• D.Multicast routing protocols are used to establish and maintain multicast routes and forward multicast packets correctly and efficiently.

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Which of the following are the necessary configurations of the firewall? (Multiple choice)

• A.Configure security policies between zones
• B.Configure the sysname of the firewall
• C.Modify the priority of the default security zone
• D.Classify the port into the corresponding security zone

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After a BGP peer relationship is established between two ends, changing the router ID of one end resets the BGP peer relationship.

• A.TRUE
• B.FALSE

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The advantages of network address translation (NAT) technology do not include which of the following?

• A.Allow users to retain internal solutions while changing operators, enhancing the flexibility of connecting to public networks
• B.Can effectively reduce the consumption of public IP addresses
• C.Because address translation can hide the user address of the internal network and improve the security of the internal network, a router with NAT function can directly replace the firewall
• D.Users with private addresses can access the Internet

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By default, OSPF external routes belong to which of the following types?

• A.Type 5
• B.Type 1
• C.OSPF will calculate the most suitable external route type, so there is no default situation
• D.Type 2

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