Final Exam Data Communications
The ______ layer Provide provides Host to Host communication, carries a payload from the
source to the destination without changing it or using it, does Routing and forwarding, -
ANS-Network
What is the primary duty of the Network Layer? - ANS-Packetizing (encapsulating at source and
decapsulating at destination)
What kind of switching occurs at the Network Layer? - ANS-Packet Switching
A router creates a connection between an ___ ___ and an ___ ___ - ANS-Input port, output port
A service which treats each packet independently is called a _____ _____ -
ANS-Connectionless service
True or False: Network layer is only responsible for delivery of packets from the source to the
destination - ANS-True
True or False: Packets in a message have to travel the same path to their destination -
ANS-False
What identifier is used in the Network Layer? - ANS-IP address
What uniquely and universally defines the connection of a host or a router to the Internet? -
ANS-IP address
How many bits are in an IPv4 address? - ANS-32-bits
What are the 3 different notations used in IPv4 addressing? - ANS-Binary, Dotted Decimal,
Hexadecimal
How many bits for a Class A prefix? - ANS-8
How many bits for a Class B prefix? - ANS-16
How many bits for a Class C prefix? - ANS-24
What identifies how network subdivided
and indicates where network information located? - ANS-Subnet masks
, What do Subnet Mask bits that are "1" correspond to? - ANS-Address bits contain network
information
What do Subnet Mask bits that are "0" correspond to? - ANS-Address bits contain host
information
Which class does 255.0.0.0 belong to? - ANS-A
Which class does 255.255.0.0 belong to? - ANS-B
Which class does 255.255.255.0 belong to? - ANS-C
What does CIDR stand for? - ANS-Classless Inter-domain Routing
Slash notation is also called _____ _____ - ANS-CIDR notation
What is the purpose of CIDR? - ANS-Shows how many bits represent subnet
______ means divide a classful network into smaller
subnetworks - ANS-subnetting
First address of the block also called _________ - ANS-Subnet ID
Last address of the block also called _________ - ANS-Broadcast address
A classless address is given as 167.199.170.82/27, what is:
1) number of addresses in network
2) first address
3) last address - ANS-1) 32-27 = 2^5 = 32 addresses
2) 10100111 11000111 10101010 01000000
3) 10100111 11000111 10101010 010011111
T or F? Subnet traffic separated from other subnet traffic - ANS-True
Name 3 reasons to separate subnet traffic - ANS-Enhance security
Improve performance
Simplify troubleshooting
Which organization oversees IP address allocation globally? - ANS-IANA
______ delivers a message to a single specific node - ANS-unicast
______ delivers a message to all nodes in the network - ANS-broadcast
The ______ layer Provide provides Host to Host communication, carries a payload from the
source to the destination without changing it or using it, does Routing and forwarding, -
ANS-Network
What is the primary duty of the Network Layer? - ANS-Packetizing (encapsulating at source and
decapsulating at destination)
What kind of switching occurs at the Network Layer? - ANS-Packet Switching
A router creates a connection between an ___ ___ and an ___ ___ - ANS-Input port, output port
A service which treats each packet independently is called a _____ _____ -
ANS-Connectionless service
True or False: Network layer is only responsible for delivery of packets from the source to the
destination - ANS-True
True or False: Packets in a message have to travel the same path to their destination -
ANS-False
What identifier is used in the Network Layer? - ANS-IP address
What uniquely and universally defines the connection of a host or a router to the Internet? -
ANS-IP address
How many bits are in an IPv4 address? - ANS-32-bits
What are the 3 different notations used in IPv4 addressing? - ANS-Binary, Dotted Decimal,
Hexadecimal
How many bits for a Class A prefix? - ANS-8
How many bits for a Class B prefix? - ANS-16
How many bits for a Class C prefix? - ANS-24
What identifies how network subdivided
and indicates where network information located? - ANS-Subnet masks
, What do Subnet Mask bits that are "1" correspond to? - ANS-Address bits contain network
information
What do Subnet Mask bits that are "0" correspond to? - ANS-Address bits contain host
information
Which class does 255.0.0.0 belong to? - ANS-A
Which class does 255.255.0.0 belong to? - ANS-B
Which class does 255.255.255.0 belong to? - ANS-C
What does CIDR stand for? - ANS-Classless Inter-domain Routing
Slash notation is also called _____ _____ - ANS-CIDR notation
What is the purpose of CIDR? - ANS-Shows how many bits represent subnet
______ means divide a classful network into smaller
subnetworks - ANS-subnetting
First address of the block also called _________ - ANS-Subnet ID
Last address of the block also called _________ - ANS-Broadcast address
A classless address is given as 167.199.170.82/27, what is:
1) number of addresses in network
2) first address
3) last address - ANS-1) 32-27 = 2^5 = 32 addresses
2) 10100111 11000111 10101010 01000000
3) 10100111 11000111 10101010 010011111
T or F? Subnet traffic separated from other subnet traffic - ANS-True
Name 3 reasons to separate subnet traffic - ANS-Enhance security
Improve performance
Simplify troubleshooting
Which organization oversees IP address allocation globally? - ANS-IANA
______ delivers a message to a single specific node - ANS-unicast
______ delivers a message to all nodes in the network - ANS-broadcast
