There are two hops from the source device to the destination device. Use the tracert command to detect the path. When the first hop is detected, the source device sends a UDP packet with a TTL of 1 to a larger port of the destination device. When the packet reaches the middle hop, the TTL will change to 0, so the device responds to the source device. Respond to an ICMP______ message.

• A.Time Exceeded
• B.Echo Request
• C.Port Unreachable
• D.Echo Reply

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The transport layer protocol that DNS can use is ______.

• A.UDP
• B.TCP or UDP
• C.TCP
• D.NCP

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To set a subnet mask so that 192.168.0.94 and 192.168.0.116 are not in the same network segment, the subnet mask used may be ______. (Multiple choice)

• A.255.255.255.192
• B.255.255.255.248
• C.255.255.255.224
• D.255.255.255.240

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The IP protocol corresponds to layer ______ of the OSI reference model.

• A.3
• B.2
• C.5
• D.1

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To configure Trunk on the link between Ethernet switches and allow the transmission of VLAN 10 and VLAN 20 information, you must configure ______ on the switch.

• A.[Switch] port link-type trunk
• B.[Switch-Ethernet0/1] port link-type trunk
• C.[Switch-Ethernet0/1] port trunk pvid 10
• D.[Switch] port link-type access

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