Exam 2 Review Quiz Flashcards
Which of the follow describes the local arrangement of devices using the Ethernet?
All computers attach to a single cable
T or F: IP addresses are crucial for operation of a LAN since they are used for routing packets between neighboring devices on the same LAN
False
Which of the following is used to refer to the combination of a network head and its payload?
Frame
Sending simultaneous multiple carrier waves, each with different frequency, over a single copper wire is called BLANK (full name) or BLANK (for short)
frequency division multiplexing (FDM)
The term BLANK refers to combining data streams from multiple sources for transmission over a single shared medium
multiplexing
T or F: The advantage of using copper wire over optical fiber is that copper allows higher bandwidth
False
T or F: Light traveling across optical fiber does not degrade as much as electrical signals traveling across copper wires
True
Using even parity checking, we confidently conclude that the stream 011010011 arrived with:
odd number of errors
T or F: Hardware addresses are used for communication between different LANS
False
Hardware addresses are used only on the local network (LAN) and only by the network (Data link) layer protocols. IP addresses are used across LANs to route packets from a source to a destination located on different LANs
T or F: Light traveling across optical fiber does not degrade as much as electrical signals traveling across copper wires
true
T or F: The advantage of parity checking is that it can not only detect but also correct any single-bit error
False. It can only detect
The properties of a sine wave that can be used to modulate a carrier signal are:
amplitude, frequency, and PHASE SHIFT
Nyquist and Shannon proved that both cleverer source coding (increasing the number of bits per signal) and better hardware are needed for an unlimited increase in data rates
False
Both Nyquist and Shannon proved that data rates are limited. In particular, Shannon proved that the laws of physics limit the number of bits per second that can be transmitted in a real communication system
T or F: A single PC can belong to more than one LAN
True
A PC can have several network interface cards and thus can belong to several LANs (Ethernet and wireless LAN)
The logical topology of the Ethernet is a
bus
The two most important measures of performance of a transmission system are (1) the time needed for a signal to travel over a distance, called BLANK, and (2) the maximum data rate that the system supports, called BLANK
(1) propagation delay
(2) channel capacity
T or F: In the packet switching paradigm, communication can be asynchronous
true
LANs are BLANK networks, which means that within a LAN, multiple devices share the same communication medium
multi-access
Classify traditional wireless communication by selecting all that apply from the following choices:
Unguided
Electromagnetic Energy
T or F: Unfortunately, noise is unavoidable and interferes with all types of electronic communications
False.
Noise interferes with communication using radio and copper wires, but it does not interfere with communication over optical fiber
The letters in the acronym NIC correspond to:
Network Interface Card
Computers on a LAN can by physically connected using various arrangements of wires and the main LAN topologies are (list in alphabetical order)
Bus
Mesh
Ring
Star
Using odd parity, checking we confidently conclude that the stream 011010011 arrived with:
no errors
Which of the following describes the purpose of the network (data link) layer? Select all that apply
Ability of neighboring computers on the same LAN to send and receive data
Communication over a single network
T or F: A packet from deice X to device Y on a LAN reaches the network interface of device Y only
False
Since LANs are multi-access networks, they operate on a promiscuous mode which means that frames from various senders and destined for various recipients travel on the shared medium and reach the NIC of every device on the LAN.
(added) Promiscuous mode means that
each device on a LAN receives all frames regardless of the destination address
Classify Optical Fiber by selecting all that apply from the following choices:
Light
Guided
Loss of energy of a signal traveling through optical fiber is called
attenuation
