tailieunhanh - CCNA 1 and 2 Companion Guide, Revised (Cisco Networking Academy Program) part 59

Cisco Networking Academy Program CCNA 1 and 2 Companion Guide, Revised part 59 is the Cisco approved textbook to use alongside version of the Cisco Networking Academy Program CCNA 1 and CCNA 2 web-based courses. The topics covered provide you with the necessary knowledge to begin your preparation for the CCNA certification exam (640-801, or 640-821 and 640-811) and to enter the field of network administration. | Page 549 Tuesday May 27 2003 8 57 AM Check Your Understanding 549 13. Which is an IBM-designed WAN data link for Systems Network Architecture SNA environments largely being replaced by the more versatile HDLC A. Serial Line Interface Protocol B. Point-to-Point Protocol C. Synchronous Data Link Control Protocol D. Simple Data Level Control Protocol 14 . Which WAN data link protocol is used for signaling and call setup on an ISDN D channel A. LAPD B. LAPF C. LAPB D. LAPR 15. Identify the WAN circuit-switched service s A. Plain old telephone services POTS B. Narrowband ISDN with a maximum bandwidth of Mbps C. Narrowband ISDN with a maximum bandwidth of 128 kbps D. Both A and C 16. Which service has become an extremely popular WAN technology in its own right is more efficient than but with similar services has a maximum bandwidth of Mbps and offers extremely popular 56-Kbps and 384-Kbps implementations in the United States A. Frame Relay B. C. POTS D. ATM 17. Identify the cell-switched technology technologies A. ATM B. Switched Multimegabit Data Service C. T1 D. Both A and B Page 550 Tuesday May 27 2003 8 57 AM 550 Chapter 10 WANs and Routers 18. Identify the common type s of DSL technology technologies A. High-bit-rate DSL HDSL B. Single-line DSL SDSL C. Asymmetric DSL ADSL D. All of the above 19. Which is a family of very high-speed physical layer technologies with a series of data rates available with special designations implemented at different Optical Carrier OC levels ranging from Mbps OC-1 to 9952 Mbps OC-192 that can achieve these amazing data rates by using wavelength division multiplexing WDM A. SONET B. HDSL C. ATM D. SMDS 20. Which are the kind of routers that form the primary paths for traffic that is sourced from and destined to other networks A. Internal routers B. Area Border Routers C. Backbone routers D. Autonomous System AS Boundary Routers Page 550 Tuesday May 20 2003 2 53 PM 550 Chapter