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Q61.  (Topic 1) 

: 191 

About the TTL IP header field, the following statements is correct 

A. TTL maximum possible value is 65535 

B. Under normal circumstances, the router should not be received from the interface the packet TTL = 0 

C. TTL is mainly to prevent the IP packet forwarding loops in the network, wasting network bandwidth 

D. IP packets through a network of each device, including Hub, LAN SWITCH and router, TTL value will be subtracted from the value of certain 

Answer: B,C 

134.  (Topic 1) 

: 177 

TCP's error control and flow control, the following statements is correct is. 

A. sender by the receiver to adjust the sending flow 

B. Notice the receiving end through the window flow control mechanism 

C. Notice the small window to reduce the receiver flow 

D. Increase the receiver notices the small window flow 

Answer: A,B,C 

Q62.  (Topic 4) 

The following statement on the routing priority, the right is 

A. Only for between RIP and OSPF 

B. between different routing protocols for 

C. is an important basis for routing 

D. direct route default priority is 0 

Answer: B,C,D 

Q63.  (Topic 4) 

RIP protocol routing entries are not updated in how much time will become unreachable 

A. 90s 

B. 120s 

C. 180s 

D. 240s 


Q64.  (Topic 1) 

three-switch three hosts connected users, respectively, A, B, C, A and B which requires the user to exchange the second floor, A, B and C Layer 2 isolation, A, B and C can communicate at Layer 3, will have to switch What do the following configuration 

A. A and B draw users to the same VLAN 

B. C user program to another with a different VLAN A, B 

C. A, B User host address must be on the same network segment 

D. two VLAN configured on the switch virtual interface and configure the IP address of the user's default gateway address as 

Answer: A,B,C,D 

Q65.  (Topic 4) 

The user side of the host or terminal frame relay network interface (). 




D. None of the above 


Q66.  (Topic 1) 

: 153 

UDP is a connectionless-oriented must use () to provide reliability 

A. Internet Protocol 

B. Application layer protocol 

C. Network layer protocol 

D. Transmission Control 


Q67.  (Topic 4) 

The following statement is incorrect 

A. Each static route is not the same priority can also be 

B. default route priority order of OSPF> RIP C. The larger routing cost, the better the route 

D. VRP, the routing protocol priority values indicate a higher priority higher 

Answer: C,D 

Q68.  (Topic 3) 

Switch port is configured as a trunk port, now a host to be used to connect to the port to access the network. The following operation is essential () 

A. In a global view to delete more than one VLAN on the port 

B. In the interface view, delete more than one VLAN on the port 

C. Close the interface and then re-enable to restore the default configuration 

D. Configure the interface to an access port 


Q69.  (Topic 2) 

IP address of / 22 of the subnet network address and broadcast address is 






Q70.  (Topic 4) 

Judge: Run the Frame Relay port, MAP table is a logical interface corresponding to different logical interfaces with different MAP table. 

A. True 

B. False 


Q71.  (Topic 1) 

: 183 

Has been fragmented datagram may be fragmented again. Included in the IP header () for the fragmentation and re-assembled to provide enough information. 

A. Type of Service 

B. Flag 

C. Fragment Offset 

D. header checksum 


Q72.  (Topic 1) 

: 178 

Which of the following fields in the TCP header contains the field (). 

A. Source Port 

B. Destination Port 

C. Sequence Number 

D. Ack Num 

Answer: A,B,C,D 

Q73.  (Topic 4) 

Which of the following correctly describe the routing protocol? 

A. allow the transmission of data packets in a protocol between the host 

B. define the packet format and use of the domain as a way 

C. By executing a routing algorithm to complete a protocol 

D. Specify the MAC address and IP address and time bound manner, a protocol 


Q74.  (Topic 3) 

Following a protocol that can dynamically register VLAN information 






Q75.  (Topic 2) 

HTTP protocol using TCP communication, the default port is 

A. 80 

B. 8080 

C. 110 

D. 25 


211.  (Topic 2) 

Subnet mask is the network segment 




D. depends on the type of address