《Nortel ncts real time networking 920-180题库》.pdf

Nortel 920-180 Nortel 920-180 NCTS Real Time Networking Practice Test Version 1.0 买题库 QQ:860424807 Nortel 920-180: Practice Exam QUESTION NO: 1 Which protocol is used for establishing media streams in H.323? A. G.711 B. H.450 C. H.245 D. H.225.0 Answer: C QUESTION NO: 2 The Discrete Cosine Function (DCT) in an MPEG encoder, translates blocks of which number of pixels? A. 16x16 B. 8x8 C. 2x2 D. 64x64 Answer: B QUESTION NO: 3 Other than PCM codecs, which are the most common type of codecs used for telecom voice? A. wideband codecs B. CELP codecs C. variable bit-rate codecs D. sub-band codecs Answer: B QUESTION NO: 4 Which is the correct definition of STP as applied to an Ethernet switch? A. Switch Transaction Protocol B. Simple Timing Protocol C. Spanning Tree Protocol D. Signal Transfer Point 买题库 QQ:860424807 2 Nortel 920-180: Practice Exam Answer: C QUESTION NO: 5 In a Digital Subscriber Line (DSL) network, which three functions are provided by the subscriber aggregation platform? (Choose three.) A. dynamic service selection via PPPoE B. termination of DSLAM data trunks C. voice services via GR-303 D. routing of data packets E. Bayesian filtering for spam blocking Answer: A,B,D QUESTION NO: 6 Which is a true statement about MPLS mechanisms? A. Switching decisions are made at the Label Switching Router (LSR) based in part on a label. B. Switching decisions are made at the Label Edge Router (LER) based in part on a label. C. Routing decisions are made at the Label Edge Router (LER) based in part on a label. D. Routing decisions are made at the Label Switching Router (LSR) based in part on a label. Answer: A QUESTION NO: 7 What type of network topology does RPR employ? A. Linear B. Mesh C.