The main function of the network layer is achieved through the IP protocol, including? (multiple choice)

A. IP addressing

B. IP routing

C. Forwarding of data frames

D. Bit stream forwarding

In which of the following cases, ICMP error report message is not sent? (multiple choice)

A. The body of the ICMP error report

B. All subsequent datagrams for the first fragmented datagram

C. Datagrams with multicast addresses

D. Datagram for special address 10.0.0.0

What is the role of the firewall in the security system?

A. Intrusion Detection System

B. Access control

C. Vulnerability lookup

D. System immunity

E1 is the European communication standard. How many channels are used to transmit data and transmission control signaling?

A. 23B+D

B. 30B+D

C. 23B+2D

D. 23B+2D

If the data link layer protocol is PPP, you can configure the static route without the next hop.

A. True

B. False

Assuming that there is an IP address of 190.5.6.1 and a subnet mask of 255.255.252.0, what is the network segment and subnet broadcast address of the IP address?

A. 190.5.4.0 190.5.7.255

B. 190.5.4.0 190.5.4.255

C. 190.5.4.0 190.5.4.254

D. 190.5.1.0 190.5.1.255

A company applies for a Class B IP address segment, but to connect 121 subsidiaries. The largest

subsidiary has 250 computers. Each subsidiary is in a network segment. The subnet mask can be set to

which of the following options.

(multiple choice)

A. 255.255.254.0

B. 255.255.255.0

C. 255.255.255.128

D. 255.255.255.224

Which of the following protocols can be used for file transfer? (multiple choice)

A. FTP

B. TFTP

C. Xmodem

D. icmp

When the port of Hybridrid sends a message, what are the following statements correctly? (multiple choice)

A. Hybrid port can implement packet stripping label sending in multiple VLANs.

B. When the Hybrid port and the trunk port send data, the processing method is the same.

C. Hybrid port does not contain VLAN tag for sending data;

D. The data sent by the Hybrid port may have a VLAN 1 tag.

What information is usually included in the IP routing table? (multiple choice)

A. Destination network address

B. Source address

C. Outlet

D. Next hop address