The role of telnet.read_all() in Telnetlib is to read all data until EOF. If the echo does not return EOF, it will always be blocked.

• A.False
• B.True

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In the network shown in the figure below, from a security perspective, router A refuses to receive OSPF packets and ICMP packets received from the cO/0/1 interface. Which of the following commands can achieve this requirement? (Multiple Choice)

• A.acl rumber 300o rule 5 deny ospf rule 10 deny icmp # interface GigabitEthernet0/0/1 traffic-filter inbound ac1 300o #
• B.acl number 3000 rule 5 deny 89 rule 10 deny 1 interface GigabitEtherneto/0/1 traffic-filter inbound aci 3000
• C.acL rumber 300o rule 5 deny 89 rule 10 deny icmp # interface GigabitEthernet0/0/1 traffic-filter inbound ac1 30oo #
• D.acl rumber 2000 rule 5 deny 89 rule 10 deny 1 # interface GigabitEtherneto/0/1 traffic-filter inbound ac1 2000 #

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On the switch, which VLANs can be deleted by using the undo command? (Multiple choice)

• A.vlan 1
• B.vlan 2
• C.vlan 4094
• D.vlan 1024

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If the transport layer protocol is UDP, the value of the network layer Protocol field is 6.

• A.False
• B.True

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If the Length/Type of an Ethernet data frame = 0x8100, which of the following statements is correct?

• A.There must be a TCP header in the upper layer of this data frame
• B.There must be an IP header in the upper layer of this data frame
• C.This data frame must carry VLAN TAG
• D.There must be a UDP header in the upper layer of this data frame

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