In the OSI model, which of the following is the correct description of the physical layer function?
A. Ensure that the data is transmitted correctly.
B. Determine how packets are forwarded and routed
C. Transmitting the bit stream on the channel
D. Error correction and flow control
A permanent virtual circuit is to provide a fixed virtual circuit to the user. Once the circuit is established, the link water is valid, unless the administrator manually deletes it. PVC is used for frequent and stable traffic transmission between the two ends.
A. True
B. False
Which of the following statements about OSPF are correct? (multiple choice)
A. Support for classless inter-domain routing CIDR
B. Using distance vector algorithm
C. Use triggered update, if the network topology changes, send update packets immediately, and synchronize this change in the autonomous system
D. Supports sending protocol packets by multicast address
If there is a routing loop in the network, then the packet will be forwarded on the loop link until the loop is eliminated.
A. True
B. False
The network administrator is removing multiple VLANs from the switch. When the administrator enters the
undo vlan 1 command, he receives an error message.
What is the cause of the error message?
A. VLAN can only be deleted by the user who created it
B. VLAN 1 can be deleted only after the role of VLAN 1 is assigned to other VLANs.
C. The command was not entered correctly, resulting in a syntax error
D. VLAN 1 is the default management VLAN and cannot be deleted.
Which of the following statements about Frame Relay is correct? (multiple choice)
A. DLCI is only valid on the local interface and the peer interface directly connected to it.
B. PVC is a virtual connection that can only be established between DCEs
C. The frame relay address mapping table stores the mapping relationship between the peer IP address and the DLCI of the next hop.
D. The reverse address resolution protocol can obtain the corresponding DLCI through the peer IP.
Which of the following protocols provides a connectionless transport service?
A. IP
B. IPX
C. TCP
D. UDP
In an OSPF network, the following description about the Router ID is incorrect.
A. The router IDs must be the same in the same are
B. The router IDs in different areas can be different.
C. The router ID must be the IP address of an interface on the router.
D. You must manually configure the specified router ID.
E. The prerequisite for the normal operation of OSPF is that the router has a router ID.
The following may result in the inability to establish an adjacency relationship between OSPF routers? (multiple choice)
A. The interface network segment is inconsistent
B. Ethernet or NBMA network interface priority is all zero
C. Timer parameters are inconsistent
D. The same router ID
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
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