IT 105 QUIZ 3 QUESTIONS & ANSWERS
Communication model is implemented as a - Answer -hierarchical stack
Advantages of Separating tasks and including well defined interfaces between the tasks
- Answer --Adds flexibility
-Simplifies design of protocols
-Permits modification or substitution of protocols without affecting unrelated tasks
-Permits a system to select only the protocols needed for a particular application
defines seven layers used by computer systems to communicate over a network -
Answer -The OSI (Open Systems Intercommunication) model
The dominant set of protocols for the transfer of data over the Internet. - Answer -
TCP/IP (Transmission Control Protocol/Internet Protocol)
TCP/IP protocol suite - Answer -encompasses an integrated suite of numerous
protocols that work together and guide all aspects of communication
The layer at which communication actually takes place, consisting of a bare stream of
raw data using 0 and 1 bits. - Answer -Layer 1 : Physical Layer
Physical layer is primarily implemented in hardware by a - Answer -Network Interface
Controller (NIC)
Physical access protocol includes: - Answer --Definition of the medium
-Signaling method, signal parameters, carrier frequencies, lengths of pulses,
synchronization and timing issues
-Method used to physically connect the computer to the medium; size of cables,
connector types
Specifies the electronic characteristics of the signals used to transmit data from one
network node to another; represent data as electrical, optical, or radio wave signals. -
Answer -Physical Access
Examples of Physical Layer devices - Answer -hubs, cables, etc.
,Responsible for the reliable transmission and delivery of packets between two adjacent
nodes (On the same local network) - Answer -Layer 2: Data Link Layer
Packets at the data link layer are called _______________ - Answer -frames
determines the start and end of packets - Answer -Framing
Data Link Layer is divided into which two sublayers - Answer -Software logical link
control (LLC)
Hardware medium-access control (MAC)
Error correction, flow control, retransmission, packet reconstruction and IP
datagram/frame conversions
Numbers frames and reorders received frames to recreate the original message -
Answer -Software logical link control (LLC) sublayer
Defines procedures for accessing the channel and detecting errors
Responsible for services such as data encoding, collision handling, synchronization,
and multiplexing - Answer -Hardware medium-access control (MAC) sublayer
At this layer each device on the network has an address known as the Media Access
Control (MAC) address - Answer -Hardware medium-access control (MAC) sublayer
a unique identifier assigned at the factory to a network interface controller (NIC) for use
in communications within a network. - Answer -MAC Address
Ethernet is an example of which layer - Answer -Data Link Layer
Ethernet - Answer -a wired networking technology that allows devices to communicate
with each other over a local area network (LAN
keeps a table of which MAC addresses are accessible through each of its ports -
Answer -Ethernet Switch
Functions of an Ethernet Switch - Answer --Permits point-to-point connection of any
pair of nodes
-Multiple pairs can be connected simultaneously
-Possible to connect nodes in full-duplex mode
-Each pair of connections operates at the maximum bit rate of the network
, There are no collisions in a switched Ethernet network due to the presence of dedicated
connection to each station
True or False - Answer -True
Also called the internetworking layer or IP layer
allow different networks to be interconnected by forwarding packets to network routers -
Answer -Layer 3: Network Layer
Responsible for routing packets from the source end node to the destination end node
through intermediate nodes (between different networks) - Answer -IP Protocol
a method of grouping data into packets that are transmitted over a digital network -
Answer -Packet switching
IP Protocol is performed using what - Answer -datagram packet switching and logical
IP addresses
Communications within a local network - Answer --Physical addresses for
corresponding IP addresses are looked up in a table
-IP appends a header with the physical address and passes the datagram to layer 2, the
data link layer
Communications sent outside of the local network - Answer --At each intermediate
node, the network layer removes the current node address and determines the next
node address
-The new address is added to the packet and passed to layer 2, the data link layer
Two Major Functions of the IP Protocol - Answer --Routes datagrams from node to
node until they reach their destination node
-Translates IP addresses to physical (MAC) addresses before it passes the packets to
the data link later for deliver
-Implemented at the network layer
-Translates IP address to physical address at each intermediate node until destination is
reached - Answer -Address Resolution Protocol (ARP)
Address Resolution Protocol (ARP) - Answer -A broadcast of the IP address is sent to
every node on the network. The matching node responds with a physical addre
Auxiliary protocol that creates error messages for failures at the network layer - Answer
-ICMP (Internet Control Message Protocol)
Communication model is implemented as a - Answer -hierarchical stack
Advantages of Separating tasks and including well defined interfaces between the tasks
- Answer --Adds flexibility
-Simplifies design of protocols
-Permits modification or substitution of protocols without affecting unrelated tasks
-Permits a system to select only the protocols needed for a particular application
defines seven layers used by computer systems to communicate over a network -
Answer -The OSI (Open Systems Intercommunication) model
The dominant set of protocols for the transfer of data over the Internet. - Answer -
TCP/IP (Transmission Control Protocol/Internet Protocol)
TCP/IP protocol suite - Answer -encompasses an integrated suite of numerous
protocols that work together and guide all aspects of communication
The layer at which communication actually takes place, consisting of a bare stream of
raw data using 0 and 1 bits. - Answer -Layer 1 : Physical Layer
Physical layer is primarily implemented in hardware by a - Answer -Network Interface
Controller (NIC)
Physical access protocol includes: - Answer --Definition of the medium
-Signaling method, signal parameters, carrier frequencies, lengths of pulses,
synchronization and timing issues
-Method used to physically connect the computer to the medium; size of cables,
connector types
Specifies the electronic characteristics of the signals used to transmit data from one
network node to another; represent data as electrical, optical, or radio wave signals. -
Answer -Physical Access
Examples of Physical Layer devices - Answer -hubs, cables, etc.
,Responsible for the reliable transmission and delivery of packets between two adjacent
nodes (On the same local network) - Answer -Layer 2: Data Link Layer
Packets at the data link layer are called _______________ - Answer -frames
determines the start and end of packets - Answer -Framing
Data Link Layer is divided into which two sublayers - Answer -Software logical link
control (LLC)
Hardware medium-access control (MAC)
Error correction, flow control, retransmission, packet reconstruction and IP
datagram/frame conversions
Numbers frames and reorders received frames to recreate the original message -
Answer -Software logical link control (LLC) sublayer
Defines procedures for accessing the channel and detecting errors
Responsible for services such as data encoding, collision handling, synchronization,
and multiplexing - Answer -Hardware medium-access control (MAC) sublayer
At this layer each device on the network has an address known as the Media Access
Control (MAC) address - Answer -Hardware medium-access control (MAC) sublayer
a unique identifier assigned at the factory to a network interface controller (NIC) for use
in communications within a network. - Answer -MAC Address
Ethernet is an example of which layer - Answer -Data Link Layer
Ethernet - Answer -a wired networking technology that allows devices to communicate
with each other over a local area network (LAN
keeps a table of which MAC addresses are accessible through each of its ports -
Answer -Ethernet Switch
Functions of an Ethernet Switch - Answer --Permits point-to-point connection of any
pair of nodes
-Multiple pairs can be connected simultaneously
-Possible to connect nodes in full-duplex mode
-Each pair of connections operates at the maximum bit rate of the network
, There are no collisions in a switched Ethernet network due to the presence of dedicated
connection to each station
True or False - Answer -True
Also called the internetworking layer or IP layer
allow different networks to be interconnected by forwarding packets to network routers -
Answer -Layer 3: Network Layer
Responsible for routing packets from the source end node to the destination end node
through intermediate nodes (between different networks) - Answer -IP Protocol
a method of grouping data into packets that are transmitted over a digital network -
Answer -Packet switching
IP Protocol is performed using what - Answer -datagram packet switching and logical
IP addresses
Communications within a local network - Answer --Physical addresses for
corresponding IP addresses are looked up in a table
-IP appends a header with the physical address and passes the datagram to layer 2, the
data link layer
Communications sent outside of the local network - Answer --At each intermediate
node, the network layer removes the current node address and determines the next
node address
-The new address is added to the packet and passed to layer 2, the data link layer
Two Major Functions of the IP Protocol - Answer --Routes datagrams from node to
node until they reach their destination node
-Translates IP addresses to physical (MAC) addresses before it passes the packets to
the data link later for deliver
-Implemented at the network layer
-Translates IP address to physical address at each intermediate node until destination is
reached - Answer -Address Resolution Protocol (ARP)
Address Resolution Protocol (ARP) - Answer -A broadcast of the IP address is sent to
every node on the network. The matching node responds with a physical addre
Auxiliary protocol that creates error messages for failures at the network layer - Answer
-ICMP (Internet Control Message Protocol)
