The LAND attack is performed by the attacker sending a source address and a destination address to the destination host are the destination host, the same SYN packet on source port and the destination port. When the receiver waits for the final ACK packet from the sender, the connection is always in a semi-connected state, resulting in waste of limited TCP resources at the receiving end.

• A.True
• B.False

Comment: *

Name: *

Email: *

Verification: *

In an MPLS VPN network, different CE devices can exchange routing information with the same PE device using different routing protocols. The routing protocols used between different CE devices and the same device are independent of each other.

• A.True
• B.False

Comment: *

Name: *

Email: *

Verification: *

Which of the following statements about OSPF route filtering is incorrect?

• A.Based on the link state database. When calculating the route, use the filter-policy import command. This filtering method only affects the route addition in the routing table, and has no effect on the OSPF link state database
• B.The filtering for the three types of LSAs needs to be configured on the ABR between OSPF areas
• C.Backbone interface filtering LSA. You can filter in and out directions. All LSAs except Grace LSA
• D.In the NSSA area, the filtering for the import and communication of external routes can be done on the ASBR or on the ABR.

Comment: *

Name: *

Email: *

Verification: *

If the router only needs to forward IPv6 packets, there is no need to configure any IPv4 protocols and addresses on the router.

• A.Ture
• B.False

Comment: *

Name: *

Email: *

Verification: *

Which of the following statements about RADIUS is correct?

• A.MAC authentication does not require a username and password, so you cannot use RADIUS to authenticate a user.
• B.RADIUS protocol authentication, authorization, and audit separation.
• C.RADIUS authentication and Portal authentication cannot be used together. Because Portal authentication is usually used, the Portal server can be used to authenticate users.
• D.RADIUS supports both wired and wireless access methods.

Comment: *

Name: *

Email: *

Verification: *