COMPUTER NETWORK EXAM #2 STUDY
GUIDE QUESTIONS AND ANSWERS
Wavelength: - Answer-The distance between corresponding points on a wave's cycle. is
inversely proportional to frequency.
Frame: - Answer-Structure used to transport data over a network. Contains source and
destination address, data, and a 32-bit frame check sequence. The Maximum data
amount for an Ethernet frame is 1500 bytes.
Preamble: - Answer-The field in an Ethernet frame that signals to the receiving node
that data is incoming and indicates when the data flow is about to begin.
SFD (Start- of- frame delimiter): - Answer-A 1- byte field that indicates where the data
field begins in an Ethernet frame.
RJ- 45 (registered jack 45): - Answer-The standard connector used with shielded
twisted pair and unshielded twisted pair cabling.
RJ- 11 (registered jack 11): - Answer-The standard connector used with unshielded
twisted pair cabling (usually Cat 3) to connect analog telephones.
Coaxial cable: - Answer-A type of cable that consists of a central metal conducting core,
which might be solid or stranded and is often made of copper, surrounded by an
insulator, a braided metal shielding, called braiding, and an outer cover, called the
sheath or jacket. Coaxial cable, called "coax" for short, was the foundation for Ethernet
networks.
Thinwire: - Answer-RG- 58 coaxial cable used in 10base2 networks.
Thickwire: - Answer-RG- 8 coaxial cable used in 10base5 networks.
Hub: - Answer-A multiport device that broadcasts frames received on one port to all
other ports. All ports are in the same collision domain. Hubs are also known as
concentrators. Hubs operate at the physical layer (Layer 1) of the OSI model.
Switch: - Answer-A multiport device that forwards frames to a specific port based on
their destination MAC address. Each port is in its own collision domain. Traditional
network switches operate at layer 2 of the OSI model.
Tap: - Answer-Used to make a connection with coaxial cable. The tap may be a BNC T-
connector or a vampire tap.
, Cable Tester: - Answer-A device that tests a cable for continuity impedance, frequency
response, or crosstalk.
STP (Shielded twisted pair): - Answer-A type of cable containing twisted- wire pairs that
are not only individually insulated, but also surrounded by a shielding made of a metallic
substance such as foil.
UTP (Unshielded twisted pair): - Answer-A type of cabling that consists of one or more
insulated wire pairs encased in a plastic sheath. As its name implies, does not contain
additional shielding for the twisted pairs. As a result, is both less expensive and less
resistant to noise than STP.
Straight- through cable: - Answer-Twisted pair patch cable in which the wire
terminations in both connectors follow the same scheme.
Crossover cable: - Answer-A twisted pair patch cable in which the termination locations
of the transmit and receive wires on one end of the cable are reversed.
Cross talk: - Answer-A type of interference caused by signals traveling on nearby wire
pairs infringing on another pair's signal.
Twist ratio: - Answer-The number of twists per meter or foot in a twisted pair cable.
Cladding: - Answer-The glass or plastic shield around the core of a fiber- optic cable.
reflects light back to the core in patterns that vary depending on the transmission mode.
This reflection allows fiber to bend around corners without impairing the light- based
signal.
Thinnet: - Answer-An IEEE Physical layer standard for achieving 10- Mbps throughput
over coaxial copper cable. is also known as 10Base- 2. Its maximum segment length is
185 meters, and it relies on a bus topology.
Thicknet: - Answer-An IEEE Physical layer standard for achieving a maximum of 10-
Mbps throughput over coaxial copper cable. is also known as 10Base- 5. Its maximum
segment length is 500 meters, and it relies on a bus topology.
5- 4- 3 rule: - Answer-A guideline for 10- Mbps Ethernet networks stating that between
two communicating nodes, the network cannot contain more than five network
segments connected by four repeating devices, and no more than three of the
segments may be populated.
Gigabit Ethernet: - Answer-A type of Ethernet network that is capable of 1000- Mbps, or
1- Gbps, throughput.
FOIRL: - Answer-Fiber optic inter- repeater link. The original specification for Ethernet
communication over fiber.
GUIDE QUESTIONS AND ANSWERS
Wavelength: - Answer-The distance between corresponding points on a wave's cycle. is
inversely proportional to frequency.
Frame: - Answer-Structure used to transport data over a network. Contains source and
destination address, data, and a 32-bit frame check sequence. The Maximum data
amount for an Ethernet frame is 1500 bytes.
Preamble: - Answer-The field in an Ethernet frame that signals to the receiving node
that data is incoming and indicates when the data flow is about to begin.
SFD (Start- of- frame delimiter): - Answer-A 1- byte field that indicates where the data
field begins in an Ethernet frame.
RJ- 45 (registered jack 45): - Answer-The standard connector used with shielded
twisted pair and unshielded twisted pair cabling.
RJ- 11 (registered jack 11): - Answer-The standard connector used with unshielded
twisted pair cabling (usually Cat 3) to connect analog telephones.
Coaxial cable: - Answer-A type of cable that consists of a central metal conducting core,
which might be solid or stranded and is often made of copper, surrounded by an
insulator, a braided metal shielding, called braiding, and an outer cover, called the
sheath or jacket. Coaxial cable, called "coax" for short, was the foundation for Ethernet
networks.
Thinwire: - Answer-RG- 58 coaxial cable used in 10base2 networks.
Thickwire: - Answer-RG- 8 coaxial cable used in 10base5 networks.
Hub: - Answer-A multiport device that broadcasts frames received on one port to all
other ports. All ports are in the same collision domain. Hubs are also known as
concentrators. Hubs operate at the physical layer (Layer 1) of the OSI model.
Switch: - Answer-A multiport device that forwards frames to a specific port based on
their destination MAC address. Each port is in its own collision domain. Traditional
network switches operate at layer 2 of the OSI model.
Tap: - Answer-Used to make a connection with coaxial cable. The tap may be a BNC T-
connector or a vampire tap.
, Cable Tester: - Answer-A device that tests a cable for continuity impedance, frequency
response, or crosstalk.
STP (Shielded twisted pair): - Answer-A type of cable containing twisted- wire pairs that
are not only individually insulated, but also surrounded by a shielding made of a metallic
substance such as foil.
UTP (Unshielded twisted pair): - Answer-A type of cabling that consists of one or more
insulated wire pairs encased in a plastic sheath. As its name implies, does not contain
additional shielding for the twisted pairs. As a result, is both less expensive and less
resistant to noise than STP.
Straight- through cable: - Answer-Twisted pair patch cable in which the wire
terminations in both connectors follow the same scheme.
Crossover cable: - Answer-A twisted pair patch cable in which the termination locations
of the transmit and receive wires on one end of the cable are reversed.
Cross talk: - Answer-A type of interference caused by signals traveling on nearby wire
pairs infringing on another pair's signal.
Twist ratio: - Answer-The number of twists per meter or foot in a twisted pair cable.
Cladding: - Answer-The glass or plastic shield around the core of a fiber- optic cable.
reflects light back to the core in patterns that vary depending on the transmission mode.
This reflection allows fiber to bend around corners without impairing the light- based
signal.
Thinnet: - Answer-An IEEE Physical layer standard for achieving 10- Mbps throughput
over coaxial copper cable. is also known as 10Base- 2. Its maximum segment length is
185 meters, and it relies on a bus topology.
Thicknet: - Answer-An IEEE Physical layer standard for achieving a maximum of 10-
Mbps throughput over coaxial copper cable. is also known as 10Base- 5. Its maximum
segment length is 500 meters, and it relies on a bus topology.
5- 4- 3 rule: - Answer-A guideline for 10- Mbps Ethernet networks stating that between
two communicating nodes, the network cannot contain more than five network
segments connected by four repeating devices, and no more than three of the
segments may be populated.
Gigabit Ethernet: - Answer-A type of Ethernet network that is capable of 1000- Mbps, or
1- Gbps, throughput.
FOIRL: - Answer-Fiber optic inter- repeater link. The original specification for Ethernet
communication over fiber.
