One Liners and Fill in the Blanks
Q.1. The connection points between the Network Layer and the Transport Layer is the IP number(s)
whereas the connection points between the Transport Layer and the upper layers are called Ports
which are represented by 16 bits in the TCP segment header.
Q.2. Unlike TCP the Transport Layer Protocol UDP is a connectionless protocol.
Q.3. The programmatic connection between the Network Layer and the uppe r (application)
layers is usually
established by small software running in Transport Layer. These are usually called Sockets.
Q.4. In a 802.3 LAN, IP to ethernet address translation is performed by/with ARP which stands for Address
Resolution Protocol.
Q.5. In an IP address with CIDR standard a quad can range from 0 to 255.
Q.6. Bluetooth uses Time Division Multiplexing.
Q.7. A Bluetooth network with 7 active slaves is called a Piconet.
Q.8. Bluetooth standard specifies 13 applications which are called profiles.
Q.9. As modulation technology, Bluetooth employs FSK with 1M bps.
Q.10. The number of necessary OSI layers in a bridge is two
Q.11. Routers and Gateways are internetworking-connecting devices
Q.12. A networked computer must minimally have a host-IP, a netmask and default gateway-IP numbers
set up in order to do IP-networking properly.
Q.13. An IP-address with all host bits set to 1 is called Broadcast address.
Q.14. A Class-B IP-range may have about 65000 hosts in it.
Q.15. IEEE-802.3 defines broadcast networks standards.
Q.16. The word ‗Base‘ in 10BaseT identifies the media as baseband.
Q.17. The letter ‗T‘ in 10BaseT indicates that it is a twisted-pair cable.
Q.18. An ethernet address with all bits set to 1 is called ethernet broadcast address.
Q.19. CIDR addressing scheme allows us to create subnets for efficient IP use.
Q.20. ARP is a process of obtaining ethernet addresses from IP-addresses.
Q.21. Performance of a network is usually measured by the amount of data transferred per unit time.
Q.22. Reliability of a network is usually measured by the frequency of failure (inverse of it).
Q.23. Logical to physical addressing conversion is done in the Network Layer.
Q.24. In stop and wait flow control method receiver ACKs each data frame received. The alternative to
this is called sliding window.
Q.25. CSMA stands for "Carrier Sense Multiple Access" which is standardized in IEEE 802.3.
Q.26. The 10 Mbps twisted pair ethernet is usually designated by 10BaseT.
Q.27. Ethernet or NIC addresses are 48 bit unique numbers used to identify physical devices in CSMA/CD
networks.
Q.28. Bridges divide the networks into smaller segments in order to reduce traffic.
Q.29. Repeaters and Bridges are networking connecting devices.
Q.30. In class-B IP-addresses 16 and 16 bits are reserved for host and network identification respectively.
Q.31. Topologically fully connected networks have the highest performance and the highest cost among
the possible.
Q.32. In full-duplex transmission mode devices can transmit and receive simultaneously.
Q.33. For bit-rate to be three times the baud rate we need at least 8 constellations.
Q.34. Physical Layer deals with the physical and electrical specifications.
Q.35. The term point-to-point indicates the dedicated links between two nodes.
Q.36. Bus topology is the simplest and cheapest topology to implement in small networks.
Q.37. Full-Duplex transmission mode can be characterized simply as "two way simultaneous
transmission/reception".
Q.38. Performance of a network is usually measured by bits per second
Q.39. Switching/Routing is the job of Network Layer.
Q.40. Sliding Window line discipline where only some of the enquiries are acknowledged is more efficient
then Stop-and-Wait.
Q.41. 10BaseT can have a maximum segment length of 100 meters.
Q.42. All NICs are manufactured having unique Hardware Address.
Q.43. Physical addressing, error control and access (to media) control are managed by the Data Link layer.
Q.44. An advantage of 10BaseT over 10Base2 is that 10Base2 is maintained easier than 10Base2.
Q.45. ‗Preamble‘ field at the beginning of an ethernet frame is used for synchronization.
Q.46. Bridges must have the following layers; Physical Layer 2 Data Link Layer.
Q.47. ‗Time To Live‘ field in an IP packet determines the number of hops (routers) it passes
through before it is discarded.
Q.48. A host running in an IP-network on the ethernet must be assigned these three numbers
properly in order for the networking software to operate correctly; IP address, 2. Netmask, 3.
Gateway address.
Q.49. ARP is used on IEEE-802.3 networks in order to obtain ethernet addresses using the IP
addresses.
Q.50. The field named as ‗Window Size‘ in a TCP segment heade r indicates the sliding window size.
Q.51. Standard TCP services use some standard TSAP numbers known as well known ports numbers.
Q.52. TCP is a connection oriented protocol while UDP is not.
Q.53. The three problems which limit a communication line are attenuation, distortion and noise.
Q.54. In order for a 2400 baud modem to achieve 9.6 kbps the constellation diagram must have at least
16 distinct points.
Q.55. The filter with a bandwidth of 300-3400 Hz at the end office for an ordinary voice phone
line is removed for DSL operation.
Q.56. An ADSL modem and a splitter are the required equipment residing at the customer‘s
premises for the ADSL system.
Q.57. Three of the BlueTooth profiles are Service Discovery, Serial Port, Cordless Telephony.
Q.58. In piconets of BlueTooth, Frequency Hopping Spread Spectrum technique is used with 1600
Q.59. hops/sec and hop sequence is dictated by the master.
Q.60. Pseudoternary encoding technique is used on T and S interfaces of ISDN system in order to
maintain synchronization during the long sequences of zeros.
Q.61. PRI ISDN service carries 23 bearer and 1 data channels with a total of 1544 kbps.
Q.62. Bus topology usually requires terminators at both ends of the cable.
Q.63. In half-duplex transmission mode both station can transmit and receive but not at the same time.
Q.64. Logical addressing and routing is the function of network layer.
Q.65. Mail services are being made available by application layer.
Q.66. Manchester coding is one of the polar encoding techniques which effectively eliminate DC
component of the signal.
Q.67. In Diff. Manchester, the transition in the middle is used for synchronization.
Q.68. The number of signal units per second is called baud-rate.
Q.69. In QAM both amplitude and phase of the carrier signal are varied.
Q.70. In stop-and-wait flow control technique, ever y frame is acknowledged.
Q.71. Physical Layer deals with the physical and electrical specifications.
Q.72. Full-duplex transmission mode can be characterized simply as "two way
simultaneous transmission/reception".
Q.73. All NICs are manufactured having unique ethernet address/MAC number.
Q.74. 10BaseT can have a maximum segment length of 100 meters.
Q.75. The words and numbers '10' , ‗Base‘ and ' T' in 10BaseT respectively indicate 10 Mbps baseband
and twisted pair.
Q.76. Carrier extension and Frame bursting are features added to 802.3 by the gigabit ethernet
standards.
Q.77. 1000Base-T uses 4 pairs of Cat-5 UTP.
Q.78. Flooding is a packet routing method in which incoming packet is sent to ever y neighbor
except where it came from.
Q.79. In Distance Vector Routing a router receives routing information f rom all of its neighbors
and by using the knowledge about its distance to its neighbors it constructs its own routing table which
in turn used by the router and distributed to the neighbors.
Q.80. Hierarchical Routing reduces the memory requirements at some penalty on the path
optimality in large networks with large number of routers.
Q.81. If packets from a live audio/video source are to be distributed to multiple destinations we need to
talk about Broadcast Routing.
Q.82. The 802.11 configuration in which no central coordination is used for is called Distributed
Q.83. Coordination Function
Q.84. Multipath Reception is a problem in wireless systems, which deteriorates the received signal at
the receiver.
Q.85. When there is no central coordination is employed in 802.11, channel access privileges
(who transmits when) are determined by a protocol called Carrier Sense Multiple Access /
Collision Avoidance.
Q.86. In wireless ethernet, when stations directly talk to each other, a station wanting to transmit data
when the channel is idle transmits Request To Send (RTS) frame first.
Q.87. The small clusters of stations communicating using Bluetooth are called Piconets.
Q.88. There can be only seven active slaves in a Bluetooth station cluster.
Q.89. The master station in a Bluetooth cluster employs Time Division Multiplexing in
order to communicate with slaves and send commands to them.
Q.90. The destination address field in a Bluetooth frame is three bits
Q.91. Bluetooth operates on 2.4 GHz ISM band and its range is about 10 meters.
Q.92. The PSTN term Local Loop refers to the wiring between the customer and end office of the
telecom company.
Q.93. In PSTN, in order for a modem customer to achieve 56 kbps transmission rate, the connection to ISP
must be digital.
Q.94. QAM stands for Quadrature Amplitude Modulation which means changing both Amplitude and Phase
of the carrier.
Q.95. In 128-QAM, one change in carrier transmits seven bits including parity.
Q.96. In DMT which is employed in DSL, of 256 f requency channels 5 are not used to prevent
interference between voice and data signals.
Q.97. Original antialiasing filter is removed in DSL, but a pair of Low Pass Filter is still used to split
voice and data channels in end office and in customer premises.
a. ISDN stands for Integrated Services Digital Network.
Q.98. In ISDN two standard services are provided; BRI and PRI.
Q.99. A B channel in ISDN service has the data rate of 64 kbps whereas a D channel carries 16 kbps.
Q.100. 23B+D configuration in ISDN is capable of carrying 1544 kbps.
Q.101. Two features brought by gigabit ethernet, Carrier Extension, Frame Bursting are
required to achieve 200 m in hub based networks.
Q.102. Fast ethernet on Cat-5 cable runs at most 100 meters.
Q.103. Hubs/Repeaters just repeat the incoming data and send it through all othe r connected lines.
Q.104. Different modes of light travel different total distances resulting in dispersion which causes
distortion in multimode fibers at long distances.
Q.105. Multistation Access Unit is a term which refers to devices used to form a star topology in Token
Ring.
Q.106. FDDI stands for Fiber Distributed Data Interface.
Q.107. In Token Ring there is at least one frame traveling around the ring, and it is called the Token.
Q.108. The communication speed in FDDI is 100 Mbps.
Q.109. Two common transmission rates in ATM are 155.52 Mbps and 622 Mbps.
Q.110. In ATM systems delivery is not guaranteed but the order is.
Q.111. Since the ATM cell size is 53 bytes ATM routers can be designed to be entirely
hardware (no software).
Q.112. In ATM, after the connection establishment between the source and destination, data always
follow the same route which is called Virtual Circuit.
Q.113. Fiber, among other common transmission media, has the best performance thanks to its
high bandwidth and low EMI.
Q.114. OSI stands for Open Systems Interface.
Q.115. Service-point addressing (different number for each program) is the task of transport lay er in
OSI 7- layer model.
Q.116. Signaling standards is in the interest of physical layer.
Q.117. Ethernet bridges consist of physical and data-link layer(s).
Q.118. In an ethernet network the interfaces are identified/addressed by their ethernet
address/hardware address/MAC address.
Q.119. The number of pins on a RJ-45 connector at the end of a cat-5 cable is 8.
Q.120. In Differential Manchester represents the binary stream 001011.
Q.121. In an ethernet frame specified by IEEE 802.3, preamble is used for synchronization.
Q.122. In Manchester encoding represents the binary stream 001101.
Q.123. The destination address in an ethernet frame is 48 bits.
Q.124. The ‗Time-To-Live‘ field in IP-datagram determines the number of hops.
Q.125. Netmask is used to separate the network address from the IP address.
Q.126. The service that converts hostnames into host IP numbers is called Name Service.
Q.127. The interface IP-numbers of a router between IP networks shall be selected from the ranges of the
connected networks.
Q.128. Routing table defines where to deliver the IP-packets when the destination is not in the
same network.
Q.129. Exponential Back-off algorithm is used to determine the time to wait for another
transmission attempt in CSMA-CD networks.
Q.130. Fast ethernet on twisted pair cable is referred as 100Base-TX.
Q.131. Fast ethernet on fiber runs at most 2000 meters.
Q.132. Bit rate is bits per second whereas the baud rate is symbols/changes pe r second.
Q.133. ADSL stands for Asymmetric Digital Subscriber Line.
Q.134. Channel 0 in DMT of DSL is used for basic telephony service.
Q.135. In DSL, a filter called splitter must be used in both customers‘ and Telco‘s premises.
Q.136. 23B+D configuration in ISDN is capable of carrying 1544 kbps.
Q.137. CSMA/CD is not used in wireless ethernet because most radio devices can not listen and
transmit simultaneously.
Q.138. The RF communication technique in wireless ethernet, in which the communication frequency
is periodically switched within a set of predetermined sequence, is called Frequency Hopping Spread
Spectrum.
Q.139. A Bluetooth device is expected to support the applications Generic Access and Service Discovery
and the othe r profiles are optional.
Q.140. A collection of Bluetooth piconets is called scatternet.
Q.141. In Differential Manchester encoding technique, the transition in the middle helps
synchronization but reduces the transmission rate.
Q.142. In Link State Routing routing, a router obtains the distances of its neighbors and shares
this information with all other routers it knows using specially designed packets.
Q.143. ARP is used on IEEE-802.3 networks in order to obtain ethernet address from IP address
Q.144. In class-A IP-addresses 24 bits are reserved for host identification.
Q.1. The connection points between the Network Layer and the Transport Layer is the IP number(s)
whereas the connection points between the Transport Layer and the upper layers are called Ports
which are represented by 16 bits in the TCP segment header.
Q.2. Unlike TCP the Transport Layer Protocol UDP is a connectionless protocol.
Q.3. The programmatic connection between the Network Layer and the uppe r (application)
layers is usually
established by small software running in Transport Layer. These are usually called Sockets.
Q.4. In a 802.3 LAN, IP to ethernet address translation is performed by/with ARP which stands for Address
Resolution Protocol.
Q.5. In an IP address with CIDR standard a quad can range from 0 to 255.
Q.6. Bluetooth uses Time Division Multiplexing.
Q.7. A Bluetooth network with 7 active slaves is called a Piconet.
Q.8. Bluetooth standard specifies 13 applications which are called profiles.
Q.9. As modulation technology, Bluetooth employs FSK with 1M bps.
Q.10. The number of necessary OSI layers in a bridge is two
Q.11. Routers and Gateways are internetworking-connecting devices
Q.12. A networked computer must minimally have a host-IP, a netmask and default gateway-IP numbers
set up in order to do IP-networking properly.
Q.13. An IP-address with all host bits set to 1 is called Broadcast address.
Q.14. A Class-B IP-range may have about 65000 hosts in it.
Q.15. IEEE-802.3 defines broadcast networks standards.
Q.16. The word ‗Base‘ in 10BaseT identifies the media as baseband.
Q.17. The letter ‗T‘ in 10BaseT indicates that it is a twisted-pair cable.
Q.18. An ethernet address with all bits set to 1 is called ethernet broadcast address.
Q.19. CIDR addressing scheme allows us to create subnets for efficient IP use.
Q.20. ARP is a process of obtaining ethernet addresses from IP-addresses.
Q.21. Performance of a network is usually measured by the amount of data transferred per unit time.
Q.22. Reliability of a network is usually measured by the frequency of failure (inverse of it).
Q.23. Logical to physical addressing conversion is done in the Network Layer.
Q.24. In stop and wait flow control method receiver ACKs each data frame received. The alternative to
this is called sliding window.
Q.25. CSMA stands for "Carrier Sense Multiple Access" which is standardized in IEEE 802.3.
Q.26. The 10 Mbps twisted pair ethernet is usually designated by 10BaseT.
Q.27. Ethernet or NIC addresses are 48 bit unique numbers used to identify physical devices in CSMA/CD
networks.
Q.28. Bridges divide the networks into smaller segments in order to reduce traffic.
Q.29. Repeaters and Bridges are networking connecting devices.
Q.30. In class-B IP-addresses 16 and 16 bits are reserved for host and network identification respectively.
Q.31. Topologically fully connected networks have the highest performance and the highest cost among
the possible.
Q.32. In full-duplex transmission mode devices can transmit and receive simultaneously.
Q.33. For bit-rate to be three times the baud rate we need at least 8 constellations.
Q.34. Physical Layer deals with the physical and electrical specifications.
Q.35. The term point-to-point indicates the dedicated links between two nodes.
Q.36. Bus topology is the simplest and cheapest topology to implement in small networks.
Q.37. Full-Duplex transmission mode can be characterized simply as "two way simultaneous
transmission/reception".
Q.38. Performance of a network is usually measured by bits per second
Q.39. Switching/Routing is the job of Network Layer.
Q.40. Sliding Window line discipline where only some of the enquiries are acknowledged is more efficient
then Stop-and-Wait.
Q.41. 10BaseT can have a maximum segment length of 100 meters.
Q.42. All NICs are manufactured having unique Hardware Address.
Q.43. Physical addressing, error control and access (to media) control are managed by the Data Link layer.
Q.44. An advantage of 10BaseT over 10Base2 is that 10Base2 is maintained easier than 10Base2.
Q.45. ‗Preamble‘ field at the beginning of an ethernet frame is used for synchronization.
Q.46. Bridges must have the following layers; Physical Layer 2 Data Link Layer.
Q.47. ‗Time To Live‘ field in an IP packet determines the number of hops (routers) it passes
through before it is discarded.
Q.48. A host running in an IP-network on the ethernet must be assigned these three numbers
properly in order for the networking software to operate correctly; IP address, 2. Netmask, 3.
Gateway address.
Q.49. ARP is used on IEEE-802.3 networks in order to obtain ethernet addresses using the IP
addresses.
Q.50. The field named as ‗Window Size‘ in a TCP segment heade r indicates the sliding window size.
Q.51. Standard TCP services use some standard TSAP numbers known as well known ports numbers.
Q.52. TCP is a connection oriented protocol while UDP is not.
Q.53. The three problems which limit a communication line are attenuation, distortion and noise.
Q.54. In order for a 2400 baud modem to achieve 9.6 kbps the constellation diagram must have at least
16 distinct points.
Q.55. The filter with a bandwidth of 300-3400 Hz at the end office for an ordinary voice phone
line is removed for DSL operation.
Q.56. An ADSL modem and a splitter are the required equipment residing at the customer‘s
premises for the ADSL system.
Q.57. Three of the BlueTooth profiles are Service Discovery, Serial Port, Cordless Telephony.
Q.58. In piconets of BlueTooth, Frequency Hopping Spread Spectrum technique is used with 1600
Q.59. hops/sec and hop sequence is dictated by the master.
Q.60. Pseudoternary encoding technique is used on T and S interfaces of ISDN system in order to
maintain synchronization during the long sequences of zeros.
Q.61. PRI ISDN service carries 23 bearer and 1 data channels with a total of 1544 kbps.
Q.62. Bus topology usually requires terminators at both ends of the cable.
Q.63. In half-duplex transmission mode both station can transmit and receive but not at the same time.
Q.64. Logical addressing and routing is the function of network layer.
Q.65. Mail services are being made available by application layer.
Q.66. Manchester coding is one of the polar encoding techniques which effectively eliminate DC
component of the signal.
Q.67. In Diff. Manchester, the transition in the middle is used for synchronization.
Q.68. The number of signal units per second is called baud-rate.
Q.69. In QAM both amplitude and phase of the carrier signal are varied.
Q.70. In stop-and-wait flow control technique, ever y frame is acknowledged.
Q.71. Physical Layer deals with the physical and electrical specifications.
Q.72. Full-duplex transmission mode can be characterized simply as "two way
simultaneous transmission/reception".
Q.73. All NICs are manufactured having unique ethernet address/MAC number.
Q.74. 10BaseT can have a maximum segment length of 100 meters.
Q.75. The words and numbers '10' , ‗Base‘ and ' T' in 10BaseT respectively indicate 10 Mbps baseband
and twisted pair.
Q.76. Carrier extension and Frame bursting are features added to 802.3 by the gigabit ethernet
standards.
Q.77. 1000Base-T uses 4 pairs of Cat-5 UTP.
Q.78. Flooding is a packet routing method in which incoming packet is sent to ever y neighbor
except where it came from.
Q.79. In Distance Vector Routing a router receives routing information f rom all of its neighbors
and by using the knowledge about its distance to its neighbors it constructs its own routing table which
in turn used by the router and distributed to the neighbors.
Q.80. Hierarchical Routing reduces the memory requirements at some penalty on the path
optimality in large networks with large number of routers.
Q.81. If packets from a live audio/video source are to be distributed to multiple destinations we need to
talk about Broadcast Routing.
Q.82. The 802.11 configuration in which no central coordination is used for is called Distributed
Q.83. Coordination Function
Q.84. Multipath Reception is a problem in wireless systems, which deteriorates the received signal at
the receiver.
Q.85. When there is no central coordination is employed in 802.11, channel access privileges
(who transmits when) are determined by a protocol called Carrier Sense Multiple Access /
Collision Avoidance.
Q.86. In wireless ethernet, when stations directly talk to each other, a station wanting to transmit data
when the channel is idle transmits Request To Send (RTS) frame first.
Q.87. The small clusters of stations communicating using Bluetooth are called Piconets.
Q.88. There can be only seven active slaves in a Bluetooth station cluster.
Q.89. The master station in a Bluetooth cluster employs Time Division Multiplexing in
order to communicate with slaves and send commands to them.
Q.90. The destination address field in a Bluetooth frame is three bits
Q.91. Bluetooth operates on 2.4 GHz ISM band and its range is about 10 meters.
Q.92. The PSTN term Local Loop refers to the wiring between the customer and end office of the
telecom company.
Q.93. In PSTN, in order for a modem customer to achieve 56 kbps transmission rate, the connection to ISP
must be digital.
Q.94. QAM stands for Quadrature Amplitude Modulation which means changing both Amplitude and Phase
of the carrier.
Q.95. In 128-QAM, one change in carrier transmits seven bits including parity.
Q.96. In DMT which is employed in DSL, of 256 f requency channels 5 are not used to prevent
interference between voice and data signals.
Q.97. Original antialiasing filter is removed in DSL, but a pair of Low Pass Filter is still used to split
voice and data channels in end office and in customer premises.
a. ISDN stands for Integrated Services Digital Network.
Q.98. In ISDN two standard services are provided; BRI and PRI.
Q.99. A B channel in ISDN service has the data rate of 64 kbps whereas a D channel carries 16 kbps.
Q.100. 23B+D configuration in ISDN is capable of carrying 1544 kbps.
Q.101. Two features brought by gigabit ethernet, Carrier Extension, Frame Bursting are
required to achieve 200 m in hub based networks.
Q.102. Fast ethernet on Cat-5 cable runs at most 100 meters.
Q.103. Hubs/Repeaters just repeat the incoming data and send it through all othe r connected lines.
Q.104. Different modes of light travel different total distances resulting in dispersion which causes
distortion in multimode fibers at long distances.
Q.105. Multistation Access Unit is a term which refers to devices used to form a star topology in Token
Ring.
Q.106. FDDI stands for Fiber Distributed Data Interface.
Q.107. In Token Ring there is at least one frame traveling around the ring, and it is called the Token.
Q.108. The communication speed in FDDI is 100 Mbps.
Q.109. Two common transmission rates in ATM are 155.52 Mbps and 622 Mbps.
Q.110. In ATM systems delivery is not guaranteed but the order is.
Q.111. Since the ATM cell size is 53 bytes ATM routers can be designed to be entirely
hardware (no software).
Q.112. In ATM, after the connection establishment between the source and destination, data always
follow the same route which is called Virtual Circuit.
Q.113. Fiber, among other common transmission media, has the best performance thanks to its
high bandwidth and low EMI.
Q.114. OSI stands for Open Systems Interface.
Q.115. Service-point addressing (different number for each program) is the task of transport lay er in
OSI 7- layer model.
Q.116. Signaling standards is in the interest of physical layer.
Q.117. Ethernet bridges consist of physical and data-link layer(s).
Q.118. In an ethernet network the interfaces are identified/addressed by their ethernet
address/hardware address/MAC address.
Q.119. The number of pins on a RJ-45 connector at the end of a cat-5 cable is 8.
Q.120. In Differential Manchester represents the binary stream 001011.
Q.121. In an ethernet frame specified by IEEE 802.3, preamble is used for synchronization.
Q.122. In Manchester encoding represents the binary stream 001101.
Q.123. The destination address in an ethernet frame is 48 bits.
Q.124. The ‗Time-To-Live‘ field in IP-datagram determines the number of hops.
Q.125. Netmask is used to separate the network address from the IP address.
Q.126. The service that converts hostnames into host IP numbers is called Name Service.
Q.127. The interface IP-numbers of a router between IP networks shall be selected from the ranges of the
connected networks.
Q.128. Routing table defines where to deliver the IP-packets when the destination is not in the
same network.
Q.129. Exponential Back-off algorithm is used to determine the time to wait for another
transmission attempt in CSMA-CD networks.
Q.130. Fast ethernet on twisted pair cable is referred as 100Base-TX.
Q.131. Fast ethernet on fiber runs at most 2000 meters.
Q.132. Bit rate is bits per second whereas the baud rate is symbols/changes pe r second.
Q.133. ADSL stands for Asymmetric Digital Subscriber Line.
Q.134. Channel 0 in DMT of DSL is used for basic telephony service.
Q.135. In DSL, a filter called splitter must be used in both customers‘ and Telco‘s premises.
Q.136. 23B+D configuration in ISDN is capable of carrying 1544 kbps.
Q.137. CSMA/CD is not used in wireless ethernet because most radio devices can not listen and
transmit simultaneously.
Q.138. The RF communication technique in wireless ethernet, in which the communication frequency
is periodically switched within a set of predetermined sequence, is called Frequency Hopping Spread
Spectrum.
Q.139. A Bluetooth device is expected to support the applications Generic Access and Service Discovery
and the othe r profiles are optional.
Q.140. A collection of Bluetooth piconets is called scatternet.
Q.141. In Differential Manchester encoding technique, the transition in the middle helps
synchronization but reduces the transmission rate.
Q.142. In Link State Routing routing, a router obtains the distances of its neighbors and shares
this information with all other routers it knows using specially designed packets.
Q.143. ARP is used on IEEE-802.3 networks in order to obtain ethernet address from IP address
Q.144. In class-A IP-addresses 24 bits are reserved for host identification.
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