宁波大学计算机网络多选题.doc

1. The URL(Uniform Resource Locator) include: A. Protocol name B. Host name C. Path name D. User name E. Object name2. TCP congestion control, there are those State in TCP Sender: A. Congestion Avoidance B. Fast recovery C. Slow Start D. Timeout E. GBN3. When receive a segment in TCP Receiver, It can action with: A. Delayed ACK. B. Immediately send single cumulative ACK C. Immediately send duplicate ACK D. Immediate send ACK E. Nothing to do4. Which are the Key Network-Layer Functions: A. forwarding B. routing C. Connection setup D. multiple access E. Address translator5.IN DNS service, these servers are needed: A. Top-level domain (TLD) server B. Authoritative DNS servers C. Local Name server D. Proxy DNS server D. Root DNS server1. Which Method types are in HTTP: A. GET B. POST C. SELECT D. PUT E. HEAD2. TCP sender congestion control, there are these action in TCP Sender: A. window grows linearly B. window grows exponentially C. Threshold set to CongWin/2 and CongWin set to Threshold D. Threshold set to CongWin/2 and CongWin set to 1 MSS E. Threshold set to CongWin*2 and CongWin set to 1 MSS3. TCP retransmission can be caused by: A. lost data B. lost ACK C. premature timeout D. premature ACK E. ACK4. ICMP do not error reporting about: A. unreachable host B. unknown network C. unknown protocol D. unknown username E. unknown filename5.For P2P file sharing, we can implement it by: A. Query flooding B. Queue flooding C. centralized directory D. decentralized directory E. CDNs directory1. which are Wireless access networks: A. Wireless LANs B. UWB C. Wider-area wireless access D. Wireless mouse2. In Client-server architecture, clients can be: A. Communicate with server B. Intermittently connected C. Have dynamic IP addresses D. Communicate directly with each other3. Web caching can： A. Reduce response time for client request. B. Reduce traffic on an institutions access link. C. Result in Providers to effectively deliver content D. Guarantee QOS4. In TCP, Retransmissions can be triggered by: A. Timeout events B. Duplicate acks C. Duplicate datas D. Flow control5. ICMP can reporting error about: A. Unreachable host B. Unknown network C. Unknown protocol D. Unknown username6. Which are types of MAC Protocols? A. Channel Partitioning B. Random Access C. Hand work D. Taking turns7. In Selective repeat RDT, receiver need those FSM: A. Packet n in rcvbase, rcvbase+N-1 B. Packet n in rcvbase-N,rcvbase-1 C. Packet n in rcvbase+N,rcvbase+2N D. Otherwise1. which are Radio link types: A. Terrestrial microwave B. Fiber optic cable C. Wide-area (e.g., cellular) D. Satellite2. What transport service does an application need: A. Data loss B. Bandwidth C. Time Sensitive D. Morning call3. Which element are in Mail Servers: A. Mailbox contains incoming messages for user B. Message queue of outgoing (to be sent) mail messages C. SMTP protocol between mail servers to send email messages D. NAT device for outgoing mails4. In Selective repeat RDT, sender need those FSM: A. Data from above B. Timeout(n) C. ACK(n) D. Receive packet( n)5.The motivation of IPv6 may be: A. Header format helps speed processing/forwarding B. Header changes to facilitate QoS C. Collecting more revenue D. 32-bit address space completely allocated6. ARP Table is used for IP/MAC address mappings on s