Which of the following statements about the TTL field in the IP packet header is correct?

• A.TTL defines the number of packets the source host can send
• B.TTL defines the time interval that the source host can send packets
• C.Every time an IP packet passes through a router, its TTL value will be increased by 1
• D.Every time an IP packet passes through a router, its TTL value will be reduced by 1

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The MAC address of the existing switch is shown in the figure, which of the following statements is correct?

• A.The data frame with source MAC address 5489-9811-0b49 and destination MAC address 5489-989d-1d30 learned from the port is forwarded from Eth0/0/2 port
• B.The data frame with source MAC address 5489-9885-18a8 and destination MAC address 5489-989d-1d30 learned from the port is forwarded from Eth0/0/1 port
• C.When the switch restarts, the MAC address learned by port Eth0/0/3 needs to be relearned
• D.When the switch restarts, the MAC address learned by port Eth0/0/2 does not need to be relearned

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In the network shown in the figure, the following configuration exists in the Router A device, and which of the following statement is correct? (Multiple choice) ip route-static 10.0.2.2 255.255.255.255 10.0.12.2 ip route-static 10.0.2.2 255.255.255.255 10.0.21.2 preference 40

• A.If the G0/0/1 port is Down, the route NextHop of Router A to 10.0.2.2 is changed to 10.0.21.2
• B.The NextHop reaching 10.0.2.2 in Router A's routing table is 10.0.12.2
• C.If the G0/0/2 port is Down, the route NextHop of Router A to 10.0.2.2 is changed to 10.0.12.2
• D.The NextHop reaching 10.0.2.2 in Router A's routing table is 10.0.21.2

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DHCP server can use different address ranges to assign clients. Which one is correct about the description of the assigned addresses? (Multiple choice)

• A.In the DHCP address pool, search for the IP addresses available for allocation in sequence, that is, the IP address found first
• B.Regarding the IP addresses that exceed the lease period and have conflicts queried by the DHCP server, if an available IP address is found, it can be assigned E can be the IP address that the client once conflicted with other clients
• C.It can be the IP address used by the client, that is, the address of the Requested IpAddr option in the DHCP DISCOVER message sent by the client
• D.It can be the IP address statically bound to the client's MAC address in the DHCP server's database

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What is the total length of the VLAN frame defined by IEEE802.1Q?

• A.4
• B.3
• C.2
• D.1

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