11．以太網(wǎng)屬于(      )

A.點到點網(wǎng)絡(luò)                             B.廣播網(wǎng)絡(luò)

C.非廣播網(wǎng)絡(luò)                             D.NBMA網(wǎng)絡(luò)

12．下列屬于無線局域網(wǎng)的標準是(      )

A.802.4a                                 B.802.5b

C.802.9a                                 D.802.11a

13．以明文方式傳輸用戶名和口令的是(      )

A.PAP                                    B.CHAP

C.LAP                                    D.MD5

14．路由毒化是指當(dāng)一條路由信息變?yōu)闊o效后，路由器不會立即將它從路由表中刪除，為了立即清除相鄰路由器間的環(huán)路，只要將其度量值改為(     )

A.8                                      B.10

C.15                                     D.16

15．IGP傳播路由的協(xié)議是在(     )

A.區(qū)域內(nèi)                                 B.局域網(wǎng)內(nèi)

C.區(qū)域間                                 D.自治系統(tǒng)

16．路由信息所不包括的內(nèi)容是(     )

A.源地址                                 B.下一跳

C.路由權(quán)值                               D.目標網(wǎng)絡(luò)

17．以下路由表項目中，要由網(wǎng)絡(luò)管理員手動配置的是(     )

A.靜態(tài)路由                               B.動態(tài)路由

C.直接路由                               D.管理距離

18．E1數(shù)字中繼中，負責(zé)幀同步的時隙數(shù)目是(     )

A.0                                      B.1

C.2                                      D.31

19．SDH的幀結(jié)構(gòu)是一種塊狀幀，SDH的數(shù)據(jù)每秒傳送幀數(shù)為(      )

A.512                                    B.1024

C.2048                                   D.8000

20．GSM無線通信中，負責(zé)傳輸?shù)恼Z音邏輯通道是(     )

A.TCH                                    B.PCH

C.SCH                                    D.SDCCH