諾西文檔(資料)開發(fā)工程師筆試題

1、Test for CandidatesDirections:1. Please answer all the questions in another paper. (請在另外一張白紙上答題 2. Fill in your name in the paper.(在白紙上寫上你的名字3. Try to finish the exam within 1 hour.(盡量在 1小時內(nèi)完成Part Please give the English and Chinese descriptions to the following abbreviations (20p, 2 point/question.

2、e.g. BGP: Border Gateway Protocol, 邊界網(wǎng)關(guān)協(xié)議1. ADSL:2. SIP:3. AAA:4. PPPoE:5. DSLAM:6. CDMA:7. ATM:8. RADIUS:9. POTS:10. P-CSCF:Part There is only one correct answer for each question, please mark the right one with “ ” (10p, 1 point/question.11. The range of 0 Hz to 4 kHz is reserved for analog voice

3、traffic. ADSL occupies frequencies above that range. What is the upper boundary for current ADSL implementations?A. 3 kHzB. 4 kHzC. 1.1 MHzD. 40 kHz12. Which layer of the OSI reference model is responsible for ensuring reliable end-to-end delivery of data?A. ApplicationB. PresentationC. SessionD. Tr

4、ansportE. NetworkF. Data-Link13.Four LAN switches are connected together as shown in the figure below: Study the figure carefully. What is the purpose of the Spanning Tree Protocol (STP that is operating in the switch topology?A. To elect a particular switch as backup designated switch.B. To prevent

5、 frames from looping and have one active Layer 2 path through the switches network.C. To select the best path to a remote destination that is on a different network.D. To learn the MAC addresses of host attached to the switches network.E. To distribute VLAN configuration information throughout the s

6、witched network.14. What protocol is used to find the hardware address of a local device?A. RARPB. ARPC. IPD. ICMPE. BootP15. You want to implement a mechanism that automates the IP configuration, including IP address, subnet mask, default gateway, and DNS information. Which protocol will you use to

7、 accomplish this?A. SMTPB. SNMPC. DHCPD. ARP16. Which class of IP address provides a maximum of only 254 host addresses per network ID?A. Class AB. Class BC. Class CD. Class DE. Class E17. If you use either Telnet or FTP, which is the highest layer you are using to transmit data?A. ApplicationB. Pre

8、sentationC. SessionD. Transport18. The DoD model (also called the TCP/IP stack has four layers. Which layer of the DoD model is equivalent to the Network layer of the OSI model?A. ApplicationB. Host-to-HostC. InternetD. Network Access19.The following illustration shows a data structure header. What

9、protocol is this header from? A. IPB. ICMPC. TCPD. UDPE. ARPF. RARP20. PAT allows which of the following?A. One-to-one IP address translation through the CPE routerB. Many-to-one IP address translation through the CPE routerC. Application-specific port numbers to be manually configured for translati

10、onD. Static IP address translationsPart There are at least two correct answers for each question, please mark the right answers with “ ” (20p, 2 point/question.21. What are the decimal and hexadecimal equivalents of the binary number 10011101? (Choose two.A. 159B. 157C. 185D. 0x9DE. 0xD9F. 0x15922.

11、Which of the following describe the DHCP Discover message? (Choose two.A. It uses FF:FF:FF:FF:FF:FF as a layer 2 broadcast.B. It uses UDP as the Transport layer protocol.C. It uses TCP as the Transport layer protocol.D. It does not use a layer 2 destination address.23. Which statements are true rega

12、rding ICMP packets? (Choose two.A. They acknowledge receipt of a TCP segment.B. They guarantee datagram delivery.C. They can provide hosts with information about network problems.D. They are encapsulated within IP datagrams.E. They are encapsulated within UDP datagrams.24. Which of the following are

13、 TCP/IP protocols used at the Application layer of the OSI model? (Choose three.A. IPB. TCPC. TelnetD. FTPE. TFTP25. Which of the following are private IP addresses?A. B. 9C. 6D. 0E. 3F. 26. Which of the following are reasons why WFQ m

14、ight discard a packet instead of putting it into the correct queue?A. The hold-queue limit for all combined WFQ queues has been exceeded.B. The queue length for the flow has passed the WRED minimum drop threshold.C. T he WFQ queue length for the queue where the newly arrived packet should be placed

15、has exceeded the CDT.D. ECN feedback has been signaled, requesting that the TCP sender slow down.27. Which of the followings are not functions of the LAN Emulation Client (LEC?A. ControlB. Data forwardingC. Address resolutionD. ELAN assignment28. Which of the following protocols can provide authenti

16、cation services?A. PIXB. LoggingC. RADIUSD. TACACS+E. Firewall feature set29. In OSPF, where can a router get the router ID from?A. Loopback IP addressB. Lowest IP address of an active interface when OSPF startsC. Highest IP address of an active interface when OSPF startsD. MAC address of Ethernet i

17、nterfaceE. OSPF process ID30. Which methodologies are used to facilitate ADSL connectivity to subscribers?A. PPPoEB. VoIPoFRC. PPPoAD. QoSLong Term Business Support, Network Systems Part Answer the following questions. 31. Please translate the following paragraphs from Chinese to English, the 1st se

18、ntence is an example. (20p, about 200 Chinese words 一個虛擬路由器是一個路由設(shè)備中靜態(tài)或動態(tài)線程的集合， 提供類似物理路由器的路由和轉(zhuǎn)發(fā)服 務(wù)。 從虛擬專用網(wǎng)（VPN）用戶的角度來看，虛擬路由器應(yīng)該與物理路由器盡可能地相同。換言之， 除了極個別情況外，虛擬路由應(yīng)該在各方面（配置、管理、檢測、故障排除）都象一個專用的物 理路由器。 虛擬 路由器包括如下功能： 1.對任意路由協(xié)議組合的配置 2.對網(wǎng)絡(luò)的檢測 3.故障排除 每個 VPN 都有一個邏輯上獨(dú)立的路由域，這樣 SP 就可以更好地為用戶提供相當(dāng)靈活的虛擬路由 器服務(wù)，而無需為每一個 VPN 準(zhǔn)備一個物理路由器。 A virtual router is a collection of threads, either static or dynamic, in a routing device, that provides routing and forwarding services much like physical route