Test for CandidatesDirections:1. Please answer all the questions in another paper. ( 请在此外一张白纸上答题2. Fill in your name in the paper.(在白纸上写上你旳名字3. Try to finish the exam within 1 hour.( 尽量在 1 小时内完毕Part Please give the English and Chinese descriptions to the following abbreviations (20p, 2 Ⅰpoint/question.e.g. BGP: Border Gateway Protocol, 边界网关协议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 “ √ ” Ⅱ(10p, 1 point/question.11. The range of 0 Hz to 4 kHz is reserved for analog voice 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. TransportE. 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 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 switched 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 configur...
