诺西文档(资料)开发工程师笔试题.docxVIP

诺西文档（资料）开发工程师笔 试题 Test for Can didates Directions: Please answer all the questions in another paper.(请在另外一张白纸上答题 Fill in your name in the paper.(在白纸上写上你的名字 Try to finish the exam within 1 hour.( 尽量在 1 小时内完成 Part I Please give the English and Chinese descriptions to the following abbreviati ons (20p, 2 poin t/questi on. e.g. BGP: Border Gateway Protocol,边界网关协议 ADSL: SIP: AAA: PPPoE: DSLAM: CDMA: ATM: RADIUS: POTS: P-CSCF: Part II There is only one correct answer for each question, please mark the right one with 7 (10p，1 point/question. IL 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? 3 kHz 4 kHz C?1?1 MHz 40 kHz Which layer of the OSI reference model is responsible for ensuring reliable end-to-end delivery of data? Application Presentation Session I). Transport Nehvork Data-Link 13. Four LAN switches are connected together as shown in the figure below: Nokia Siemens “-■Hi. Switch A Priority; 8 Study the figure carefully. What is the purpose of the Spanning Tree Protocol (STP that is operating in the switch topology? To elect a particular switch as backup desig nated switch. To preve nt frames from loop ing and have one active Layer 2 path through the switches n etwork. To select the best path to a remote destination that is on a different network. To lear n the MAC addresses of host attached to the switches n etwork. To distribute VLAN con figurati on in formatio n throughout the switched n etwork. What protocol is used to find the hardware address of a local device? RARP ARP IP ICMP BootP You want to implement a mechanism that automates the IP configuration, in cludi ng IP address, sub net mask, default gateway, and DNS in formati on. Which protocol will you use to accomplish this? SMTP SNMP DHCP ARP Which class of IP address provides a maximum of only 254 host addresses per n etwork ID? Class A Class B Class C Class D Class E If you use eithe