COMPUTER NETWORKING CHAPTER 5 FINAL
REVIEW 2026 TESTED ITEMS WITH THOROUGH
SOLUTIONS AND CORRECT DETAILED
RESPONSES A+ GRADE
◉Consider the travel analogy discussed in the textbook - some actions
we take on a trip correspond to forwarding and other actions we take on
a trip correspond to routing. Which of the following travel actions below
correspond to forwarding? The other travel actions that you don't select
below then correspond to routing.
1.- A car waits at light and then turns left at the intersection.
2.- A car takes highway 80 between New York and Chicago, rather than
highway 87 to Albany and from there take Interstate 90 to Chicago.
3.- A car stops at an intersection to "gas-up" and take a "bathroom break"
4.- A climber decides to take the South Col Route to the top of Mt
Everest rather than the Northeast Ridge route.
5.- A car takes the 3rd exit from a roundabout. . Answer: 1.- A car waits
at light and then turns left at the intersection.
3.- A car stops at an intersection to "gas-up" and take a "bathroom break"
,5.- A car takes the 3rd exit from a roundabout.
◉For each of the actions below, select those actions below that are
primarily in the network-layer data plane. The other actions that you
don't select below then correspond to control-plane actions.
1.- Looking up address bits in an arriving datagram header in the
forwarding table.
2.- Computing the contents of the forwarding table.
3.- Moving an arriving datagram from a router's input port to output port
4.- Monitoring and managing the configuration and performance of an
network device.
5.- Dropping a datagram due to a congested (full) output buffer. .
Answer: 1.- Looking up address bits in an arriving datagram header in
the forwarding table.
3.- Moving an arriving datagram from a router's input port to output port
5.- Dropping a datagram due to a congested (full) output buffer.
◉We've seen that there are two approaches towards implementing the
network control plane - a per-router control-plane approach and a
software-defined networking (SDN) control-plane approach. Which of
,the following actions occur in a per-router control-plane approach? The
other actions that you don't select below then correspond to actions in an
SDN control plane.
1.- Routers send information about their incoming and outgoing links to
other routers in the network.
2.- A control agent in router receives a complete forwarding table, which
it
installs and uses to locally control datagram forwarding.
3.- All routers in the network send information about their incoming and
outgoing links to a logically centralized controller.
4.- A router exchanges messages with another router, indicating the cost
for it (the sending router) to reach a destination host. . Answer: 1.-
Routers send information about their incoming and outgoing links to
other routers in the network.
4.- A router exchanges messages with another router, indicating the cost
for it (the sending router) to reach a destination host.
◉Which of the following quality-of-service guarantees are part of the
Internet's best-effort service model? Check all that apply.
1.- Guaranteed delivery from sending host to receiving host.
2.- Guaranteed delivery time from sending host to receiving host.
, 3.- In-order datagram payload delivery to the transport layer of those
datagrams arriving to the receiving host.
4.- A guaranteed minimum bandwidth is provided to a source-to-
destination flow of packets
5.- None of the other services listed here are part of the best-effort
service model. Evidently, best-effort service really means no guarantees
at all! . Answer: 5.- None of the other services listed here are part of the
best-effort service model. Evidently, best-effort service really means no
guarantees at all!
◉Match the names of the principal router components (A,B,C,D below)
with their function and whether they are in the network-layer data plane
or control plane. . Answer: (A) are ...
- input ports, operating primarily in the data plane.
(B) is ...
- the switching fabric, operating primarily in the data plane.
(C) are ...
- output ports, operating primarily in the data plane.
(D) is ...
- the routing processor, operating primarily in the control plane.
REVIEW 2026 TESTED ITEMS WITH THOROUGH
SOLUTIONS AND CORRECT DETAILED
RESPONSES A+ GRADE
◉Consider the travel analogy discussed in the textbook - some actions
we take on a trip correspond to forwarding and other actions we take on
a trip correspond to routing. Which of the following travel actions below
correspond to forwarding? The other travel actions that you don't select
below then correspond to routing.
1.- A car waits at light and then turns left at the intersection.
2.- A car takes highway 80 between New York and Chicago, rather than
highway 87 to Albany and from there take Interstate 90 to Chicago.
3.- A car stops at an intersection to "gas-up" and take a "bathroom break"
4.- A climber decides to take the South Col Route to the top of Mt
Everest rather than the Northeast Ridge route.
5.- A car takes the 3rd exit from a roundabout. . Answer: 1.- A car waits
at light and then turns left at the intersection.
3.- A car stops at an intersection to "gas-up" and take a "bathroom break"
,5.- A car takes the 3rd exit from a roundabout.
◉For each of the actions below, select those actions below that are
primarily in the network-layer data plane. The other actions that you
don't select below then correspond to control-plane actions.
1.- Looking up address bits in an arriving datagram header in the
forwarding table.
2.- Computing the contents of the forwarding table.
3.- Moving an arriving datagram from a router's input port to output port
4.- Monitoring and managing the configuration and performance of an
network device.
5.- Dropping a datagram due to a congested (full) output buffer. .
Answer: 1.- Looking up address bits in an arriving datagram header in
the forwarding table.
3.- Moving an arriving datagram from a router's input port to output port
5.- Dropping a datagram due to a congested (full) output buffer.
◉We've seen that there are two approaches towards implementing the
network control plane - a per-router control-plane approach and a
software-defined networking (SDN) control-plane approach. Which of
,the following actions occur in a per-router control-plane approach? The
other actions that you don't select below then correspond to actions in an
SDN control plane.
1.- Routers send information about their incoming and outgoing links to
other routers in the network.
2.- A control agent in router receives a complete forwarding table, which
it
installs and uses to locally control datagram forwarding.
3.- All routers in the network send information about their incoming and
outgoing links to a logically centralized controller.
4.- A router exchanges messages with another router, indicating the cost
for it (the sending router) to reach a destination host. . Answer: 1.-
Routers send information about their incoming and outgoing links to
other routers in the network.
4.- A router exchanges messages with another router, indicating the cost
for it (the sending router) to reach a destination host.
◉Which of the following quality-of-service guarantees are part of the
Internet's best-effort service model? Check all that apply.
1.- Guaranteed delivery from sending host to receiving host.
2.- Guaranteed delivery time from sending host to receiving host.
, 3.- In-order datagram payload delivery to the transport layer of those
datagrams arriving to the receiving host.
4.- A guaranteed minimum bandwidth is provided to a source-to-
destination flow of packets
5.- None of the other services listed here are part of the best-effort
service model. Evidently, best-effort service really means no guarantees
at all! . Answer: 5.- None of the other services listed here are part of the
best-effort service model. Evidently, best-effort service really means no
guarantees at all!
◉Match the names of the principal router components (A,B,C,D below)
with their function and whether they are in the network-layer data plane
or control plane. . Answer: (A) are ...
- input ports, operating primarily in the data plane.
(B) is ...
- the switching fabric, operating primarily in the data plane.
(C) are ...
- output ports, operating primarily in the data plane.
(D) is ...
- the routing processor, operating primarily in the control plane.
