Free Access Huawei.H12-711_V3.0-ENU.v2022-08-23.q308 Practice Test (Page 7)

Question 26

Which of the following descriptions about the DNS protocol is correct?

A.If the DNS cache server does not have the domain name resolution cache to be queried, it will directly query the top-level domain name server

B.The DNS protocol port number is 53

C.There are four types of servers in the DNS domain name resolution system: root server, top-level domain name server, recursive server and cache server.

D.DNS protocol transport layer can use either TCP or UDP

Question 27

Which of the following mechanisms are used to implement MAC flooding attacks? (Multiple choice)

A.Limit on the number of MAC entries

B.MAC learning mechanism of the switch

C.ARP learning mechanism

D.The forwarding mechanism of the switch

Question 28

Which of the following factors are related to the initial priority of the USG9500 VGMP group? (Multiple choice)

A.The number of CPUs on the service board

B.VRRP priority

C.Interface bandwidth

D.Number of sub-cards on the interface board

Question 29

SIPprotocol usageSDPmessage to establish a session,SDPThe message contains a remote address or a multicast address

A.False

B.True

Question 30

IPSEC VPN technology does not support NAT traversal when encapsulated with ESP security protocol, because ESP encrypts the header of the message

A.True

B.False

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