DOEACC Society 2007 Advanced Level Course In Computer Science A9-R3: DATA COMMUNICATION

2.2 Synchronous data link control (SDLC) protocol has more control overhead than asynchronous data link control (ADCL) protocol.
2.3 In IEEE 802.11b LAN, wireless technology is used.
2.4 DPSK with 4 phases will enable the bit rate to be tripled over the corresponding 2 phase modulation.
2.5 In VLANs, the bust can be used as a common broadcast medium.
2.6 MIB is used in SMTP.
2.7 IP is a best-effort connectionless protocol.
2.8 Medium access protocols are associated with layer 2.
2.9 Switching HUBs are less efficient than simple HUBs.
2.10 CRC is also used in TCP.

3. Match words and phrases in column X with the nearest related meaning/ word(s)/phrases in column Y. Enter your selection in the “tear-off” ans sheet attached to the ques. paper, subsequent instructions therein. (1 x 10)

X Y
3.1 Cell switching A. IPv6
3.2 Coaxial cable B. UDP
3.3 Secure wireless multiplexing C. FTP
3.4 128 bit address space D. Cryptography
3.5 Converting plain text to cipher text and vice versa E. GSM
3.6 900/1800 MHz F. Cable TV
3.7 Downloading files G. 10 Hz
3.8 LAN architecture from IBM H. Star topology
3.9 2B+D I. ISDN
3.10 Transport layer of INTERNET J. Token Ring
K. FDM
L. CDMA
M. CODEC
N. MODEM
O. ATM
















4. Each statement beneath has blank space to fit 1 of the word(s) or phrases in the list beneath. Enter your option in the “tear-off” ans sheet attached to the ques. paper, subsequent instructions therein. (1 x 10)

A. TFTP B. Message C. VPN
D. Telnet E. BSC F. PPP
G. Fast LAN H. Packet I. HTTP
J. Character stuffing K. IP address L. Two
M. Bit stuffing N. MAC address O. Quantization
P. Resistance Q. Three R. Sampling

4.1 To implement a _____ over the INTERNET, tunneling is used.
4.2 _____ is the most common protocol used over dial-up lines to access the INTERNET.
4.3 The protocol used to transfer HTML pages is called _____.
4.4 In remote login, _____ is used to access distant servers.
4.5 The INTERNET is a _____ switched network.
4.6 In the INTERNET, _____ is used to forward data packets in intermediate routers.
4.7 The bottom _____ layers to TCP/IP suite are non-standard.
4.8 _____ is the 1st step in digitizing an analog signal.
4.9 The main advantage of PCM system is its _____ to system noise, offered by digital signals.
4.10 In Bisync protocol, _____ is used to avoid appropriate termination of frames.

Earning:   Approval pending.