Computer Networks I
COS2626
2022
Assignment 3
Unique Number: 879259
School of Computing
,1. Which one of the following statements regarding the SIMILARITIES and
DIFFERENCES between WANs (Wide Area Networks) and LANs (Local Area
Networks) is INCORRECT?
a. WANs and LANs may differ at Layers 3 and 4 of the OSI (Open Systems
Interconnection) model in access methods, topologies and sometimes media.
b. LANs connect nodes, such as workstations, servers, printers, and other devices, in a
small geographical area on a single organization’s network, whereas WANs use
networking devices, such as routers and modems, to connect networks spread over a
wide geographical area.
c. Both WANs and LANs use the same protocols from Layers 3 and higher of the OSI
model.
d. LANs are mostly owned and operated by the companies that use them whereas WANs
are owned and operated by telcos (telecommunications carriers), also known as NSPs
(Network Service Providers).
2. What is the DIFFERENCE between a DTE (Data Terminal Equipment) and a DCE
(Data Circuit-Terminating Equipment)?
a. The customer's endpoint device on the WAN (Wide Area Network) is called the DTE,
and the carrier's endpoint device for the WAN is called the DCE.
b. The carrier’s endpoint device on the WAN is called the DTE and the customer’s
endpoint device for the WAN is called the DCE.
3. Which one of the following is NOT a task handled by a router? A router ______.
a. forwards broadcasts over the network
b. can reroute traffic if the path of first choice is down but another path is available
c. can interpret Layer 3 and often Layer 4 addressing
d. can connect dissimilar networks
4. Which of the following are CATEGORIES of routers (More than one category
applies)?
a. Core routers, also called interior routers, are located inside networks within the same
AS (Autonomous System).
b. Edge routers, or border routers, connect an autonomous system with an inside
network, also called a trusted network.
c. Exterior router refers to any router outside the organization's AS, such as a router on
the Internet backbone.
, 5. Which statements describe the characteristics of the OSPF (Open Shortest Path
First) protocol? OSPF ________. (More than one statement applies).
a. maintains a database of other routers' links.
b. has no hop limits on a transmission path.
c. uses algorithms that prevent routing loops.
d. requires very little CPU (Central Processing Unit) power or memory resources.
6. You have been tasked with the replacement of OSPF with EIGRP (Enhanced
Interior Gateway Routing Protocol) throughout your organization, which
consists of a mixture of Cisco routers and routers from other vendors. Which
statement regarding the replacement is CORRECT?
a. EIGRP will increase CPU (Central Processing Unit) utilization on core routers.
b. Increased traffic will result from the switch to EIGRP.
c. EIGRP may not be available on non-Cisco routers.
d. Convergence time will be increased with EIGRP.
7. You are working as a network engineer with an ISP (Internet Service Provider).
A query has come to you from a client who requires a guarantee of minimum
uptime percentages if the service goes down. Which one of the following will
you choose in this scenario?
a. Broadband
b. DIA (Dedicated Internet Access)
c. DSL (Digital Subscriber Line)
d. PSTN (Public Switched Telephone Network)
8. Which statements regarding PSTN are INCORRECT (More than one statement
applies)?
a. PSTN stands for Public Switched Telephone Network.
b. PSTN may also be called Plain Old Telephone Service.
c. Nearly all PSTN these days use analog transmission and coaxial cable for backbone
connections.
d. The portion of the PSTN that connects any residence or business to the nearest CO
(Central Office) is known as the first mile.
COS2626
2022
Assignment 3
Unique Number: 879259
School of Computing
,1. Which one of the following statements regarding the SIMILARITIES and
DIFFERENCES between WANs (Wide Area Networks) and LANs (Local Area
Networks) is INCORRECT?
a. WANs and LANs may differ at Layers 3 and 4 of the OSI (Open Systems
Interconnection) model in access methods, topologies and sometimes media.
b. LANs connect nodes, such as workstations, servers, printers, and other devices, in a
small geographical area on a single organization’s network, whereas WANs use
networking devices, such as routers and modems, to connect networks spread over a
wide geographical area.
c. Both WANs and LANs use the same protocols from Layers 3 and higher of the OSI
model.
d. LANs are mostly owned and operated by the companies that use them whereas WANs
are owned and operated by telcos (telecommunications carriers), also known as NSPs
(Network Service Providers).
2. What is the DIFFERENCE between a DTE (Data Terminal Equipment) and a DCE
(Data Circuit-Terminating Equipment)?
a. The customer's endpoint device on the WAN (Wide Area Network) is called the DTE,
and the carrier's endpoint device for the WAN is called the DCE.
b. The carrier’s endpoint device on the WAN is called the DTE and the customer’s
endpoint device for the WAN is called the DCE.
3. Which one of the following is NOT a task handled by a router? A router ______.
a. forwards broadcasts over the network
b. can reroute traffic if the path of first choice is down but another path is available
c. can interpret Layer 3 and often Layer 4 addressing
d. can connect dissimilar networks
4. Which of the following are CATEGORIES of routers (More than one category
applies)?
a. Core routers, also called interior routers, are located inside networks within the same
AS (Autonomous System).
b. Edge routers, or border routers, connect an autonomous system with an inside
network, also called a trusted network.
c. Exterior router refers to any router outside the organization's AS, such as a router on
the Internet backbone.
, 5. Which statements describe the characteristics of the OSPF (Open Shortest Path
First) protocol? OSPF ________. (More than one statement applies).
a. maintains a database of other routers' links.
b. has no hop limits on a transmission path.
c. uses algorithms that prevent routing loops.
d. requires very little CPU (Central Processing Unit) power or memory resources.
6. You have been tasked with the replacement of OSPF with EIGRP (Enhanced
Interior Gateway Routing Protocol) throughout your organization, which
consists of a mixture of Cisco routers and routers from other vendors. Which
statement regarding the replacement is CORRECT?
a. EIGRP will increase CPU (Central Processing Unit) utilization on core routers.
b. Increased traffic will result from the switch to EIGRP.
c. EIGRP may not be available on non-Cisco routers.
d. Convergence time will be increased with EIGRP.
7. You are working as a network engineer with an ISP (Internet Service Provider).
A query has come to you from a client who requires a guarantee of minimum
uptime percentages if the service goes down. Which one of the following will
you choose in this scenario?
a. Broadband
b. DIA (Dedicated Internet Access)
c. DSL (Digital Subscriber Line)
d. PSTN (Public Switched Telephone Network)
8. Which statements regarding PSTN are INCORRECT (More than one statement
applies)?
a. PSTN stands for Public Switched Telephone Network.
b. PSTN may also be called Plain Old Telephone Service.
c. Nearly all PSTN these days use analog transmission and coaxial cable for backbone
connections.
d. The portion of the PSTN that connects any residence or business to the nearest CO
(Central Office) is known as the first mile.
