A local router runs IS-IS and its command output is shown in the following figure. Which of the following statements is true?

• A.The circuit level of S4/0/0 is Level-1.
• B.S4/0/0 sends IIH packets at the interval of 30s.
• C.S4/0/0 supports IPv6.
• D.The cost of S4/0/0 is 20.

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OSPF supports area authentication and interface authentication. If both authentication modes are configured, Interface authentication takes preference over area authentication.

• A.FALSE
• B.TRUE

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Which of the following routing protocols support the default route through command configuration?

• A.IS-IS
• B.ICMP
• C.OSPF
• D.BGP

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Drag the following VRRP states to the corresponding working mechanisms.

Correct Answer:

Explanation
Master
Backup
Master
Backup

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Which of the following attacks is not the network layer attack?

• A.ARP spoofing attack
• B.IP spoofing attack
• C.Smurf attack
• D.ICMP attack

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