CHAPTER 4: NETWORK LAYER
1. Which of the following groups belongs to network layer protocol? _____D____
A. IP, TCP and UDP
B. ARP, IP, and UDP
C. FTP, IMAP and IP
D. ICMP, BGP, and RIP
2. The 3-PDU is named as ____C_____
A. message
B. packet
C. datagram
D. gment
3. In a datagram network, the forwarding decision is bad on the value of the ____B field in the packet header.
A. source address
B. destination address
C. label
D. None of the choices are
电脑桌面怎么恢复正常4. HOL blocking happens on ____A_____
A. input port
B. output port
C. 软笔switching fabrics
D. all of above
5. If no free buffers in router, the arriving packets will be: A
A. dropped
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C. returned
D. marked
6. During normal IP packet forwarding at a router, which of the following packet fields are updated? ____C____
A. Source IP address
B. Destination IP address
C. Checksum
D. Destination port number
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7. Which of the following IP address doesn’t belong to the 202.115.32.0/25 network? ______D___
A. 202.115.32.1
B. 202.115.32.11
C.洞庭湖旅游攻略 202.115.32.120
D. 202.115.32.129
8. You are given an IP network of 192.168.5.0 and told that you need to parate this network into sub networks that can support a maximum of 30 hosts per subnet. This will help alleviate congestion on the network. What subnet mask can you u to create the subnets necessary to meet the given criteria? ___C______
A. 255.255.255.0
B. 255.255.255.128
C. 255.255.255.224
D. 255.255.255.240
9.流行歌曲串烧 An IP datagram of 1500 bytes (20 byte of IP header plus 1480 bytes of IP payload) arrives at a router and must be forwarded to a link with an MTU of 500 bytes. Thus the router has to fragment the datagram. To the last fragment, the value of offt should be _____D____
A. 1440
B. 1000
C. 186
D. 180
10. IP is a ____C_____ protocol.
A. connection-oriented unreliable
B. connection-oriented reliable
C. connectionless unreliable
D. connectionless reliable
11. Which ICMP message type is the basis for the Traceroute utility?B
A. Echo Request
B. TTL expired
C. Host Unreachable
D. Fragment Reasmbly Time Exceed
12. Routers in the path are not allowed to _________________B__________.
A. fragment the packet they receive
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B. change source or destination address
C. decapsulate the packet
D. All of the choices are correct
13. ____B_____ allows a site to u a t of private address for internal communication and a t of global Internet address for communication with the rest of the world.
A. DHCP
B. NAT
C. ICMP
D. None of the choices are correct
14. How many bits are there in IPv6 ? ______C___
轮滑品牌A. 32
B. 64
C. 128
D. 256
15. In CIDR notation, which of the following networks contains host 192.168.14.2?C
A. 192.168.10.0/22
B. 192.168.11.0/21
C. 192.168.12.0/23
D. 192.168.13.0/24
16. What is the limited broadcast address corresponding to the node with the following IP address: 131.15.46.59?D
