CS6250 Computer Networks Final Exam |
Questions and Answers | Download for a
Guaranteed A+ | Latest Guide 2025/2026
What are the basic components of a router
- Correct Answer - interface
processor
internetwork operating system (IOS)
RAM
NVRAM
ROM
Flash Memory
Configuration Register
Buses
Explain the forwarding (or switching) function of a router
- Correct Answer - A primary function of a router is to forward packets
toward their destination. This is accomplished by using a switching
function, which is the process used by a router to accept a packet on
one interface and forward it out another interface. A key responsibility of
the switching function is to encapsulate packets in the appropriate data
link frame type for the outgoing data link.
,Output Port
- Correct Answer - An output port stores the datagrams that have been
forwarded to it through the switching fabric, and then transmits the
datagrams on the outgoing link. The output port thus performs the
reverse data link and physical layer functionality as the input port.
Input Port - Correct Answer - performs the physical and data-link
functions of the packet switch
What is the purpose of the router's control plane
- Correct Answer - Control plane refers to all the functions and processes
that determine which path to use. Routing protocols, spanning tree, ldp,
etc are examples
What tasks occur in a router
- Correct Answer - Providing a router hostname
Setting up passwords
Disabling DNS lookup
Setting up logging
Setting timestamps for logging and debugging
Defining console, auxiliary, and virtual terminal settings
Setting up a Comm Server to access your routers more easily
,Handling password recovery
Downloading a software image from a TFTP server
File management tasks
interconnection network
- Correct Answer - An interconnection network can forward packets in
parallel as long as all the packets are being forwarded to different output
ports.
Circuit Switching
- Correct Answer - In Circuit Switching a dedicated link/path is
established across the sender and the receiver which is maintained for
the entire duration of conversation.
Circuit Switching is generally used in the public networks. It come into
existence for handling voice traffic in addition to digital data. How ever
digital data handling by the use of circuit switching methods are proved
to be inefficient. The network for Circuit Switching is shown in figure.
Packet Switching - Correct Answer - In Packet Switching, messages are
broken up into packets and each of which includes a header with source,
destination and intermediate node address information. Individual
Packets in packet switching technique take different routes to reach their
respective destination. Independent routing of packets is done in this
case for following reasons:
, Message Switching - Correct Answer - In case of Message Switching it is
not necessary to established a dedicated path in between any two
communication devices. Here each message is treated as an
independent unit and includes its own destination source address by its
own. Each complete message is then transmitted from one device to
another through internetwork
Two fundamental problems involving routers - Correct Answer -
Bandwidth and Internet population scaling
These scaling issues are caused by: a) An increasing number of devices
that connect to the Internet, 2) Increasing volumes of network traffic due
to new applications, and 3) New technologies such as optical links that
can accommodate higher volumes of traffic.
Services at high speeds: New applications require services such as
protection against delays in presence of congestion, and protection
during attacks or failures. But offering these services at very high speeds
is a challenge for routers.
What are the bottlenecks that routers face - Correct Answer -
CIDR - Correct Answer - ..., Classless Inter-Domain Routing
Questions and Answers | Download for a
Guaranteed A+ | Latest Guide 2025/2026
What are the basic components of a router
- Correct Answer - interface
processor
internetwork operating system (IOS)
RAM
NVRAM
ROM
Flash Memory
Configuration Register
Buses
Explain the forwarding (or switching) function of a router
- Correct Answer - A primary function of a router is to forward packets
toward their destination. This is accomplished by using a switching
function, which is the process used by a router to accept a packet on
one interface and forward it out another interface. A key responsibility of
the switching function is to encapsulate packets in the appropriate data
link frame type for the outgoing data link.
,Output Port
- Correct Answer - An output port stores the datagrams that have been
forwarded to it through the switching fabric, and then transmits the
datagrams on the outgoing link. The output port thus performs the
reverse data link and physical layer functionality as the input port.
Input Port - Correct Answer - performs the physical and data-link
functions of the packet switch
What is the purpose of the router's control plane
- Correct Answer - Control plane refers to all the functions and processes
that determine which path to use. Routing protocols, spanning tree, ldp,
etc are examples
What tasks occur in a router
- Correct Answer - Providing a router hostname
Setting up passwords
Disabling DNS lookup
Setting up logging
Setting timestamps for logging and debugging
Defining console, auxiliary, and virtual terminal settings
Setting up a Comm Server to access your routers more easily
,Handling password recovery
Downloading a software image from a TFTP server
File management tasks
interconnection network
- Correct Answer - An interconnection network can forward packets in
parallel as long as all the packets are being forwarded to different output
ports.
Circuit Switching
- Correct Answer - In Circuit Switching a dedicated link/path is
established across the sender and the receiver which is maintained for
the entire duration of conversation.
Circuit Switching is generally used in the public networks. It come into
existence for handling voice traffic in addition to digital data. How ever
digital data handling by the use of circuit switching methods are proved
to be inefficient. The network for Circuit Switching is shown in figure.
Packet Switching - Correct Answer - In Packet Switching, messages are
broken up into packets and each of which includes a header with source,
destination and intermediate node address information. Individual
Packets in packet switching technique take different routes to reach their
respective destination. Independent routing of packets is done in this
case for following reasons:
, Message Switching - Correct Answer - In case of Message Switching it is
not necessary to established a dedicated path in between any two
communication devices. Here each message is treated as an
independent unit and includes its own destination source address by its
own. Each complete message is then transmitted from one device to
another through internetwork
Two fundamental problems involving routers - Correct Answer -
Bandwidth and Internet population scaling
These scaling issues are caused by: a) An increasing number of devices
that connect to the Internet, 2) Increasing volumes of network traffic due
to new applications, and 3) New technologies such as optical links that
can accommodate higher volumes of traffic.
Services at high speeds: New applications require services such as
protection against delays in presence of congestion, and protection
during attacks or failures. But offering these services at very high speeds
is a challenge for routers.
What are the bottlenecks that routers face - Correct Answer -
CIDR - Correct Answer - ..., Classless Inter-Domain Routing
