Question 1

Which of these is NOT considered as customer premises equipment (CPE) in WAN connectivity?

Accepted Answer

A)  Cable modem 
B)  CSU/DSU (Channel service unit/Data service unit) 
C)  Router 
D)  Local access link 
E)  All of the above are CPE. 
A)  Cable modem 
B)  CSU/DSU (Channel service unit/Data service unit) 
C)  Router 
D)  Local access link 
E)  All of the above are CPE.

Question 2

Choose an INCORRECT statement on WAN links (do not count the Internet here).

Accepted Answer

A)  A leased line WAN link between two remote routers can become a subnet with its own subnet address. 
B)  A client company can choose either public IPs or private IPs for the WAN links. 
C)  If a border router connects to multiple leased lines, a router port is generally dedicated to each leased line. 
D)  When the WAN link is through the PSDN cloud, the border router at a client site just needs one physical link to the carrier network to connect several remote locations. 
E)  The leased line WAN link between two remote routers takes advantage of a virtual circuit for data delivery. 
A)  A leased line WAN link between two remote routers can become a subnet with its own subnet address. 
B)  A client company can choose either public IPs or private IPs for the WAN links. 
C)  If a border router connects to multiple leased lines, a router port is generally dedicated to each leased line. 
D)  When the WAN link is through the PSDN cloud, the border router at a client site just needs one physical link to the carrier network to connect several remote locations. 
E)  The leased line WAN link between two remote routers takes advantage of a virtual circuit for data delivery.

Question 3

Which of the following is INCORRECT in describing Carrier Ethernet?

Accepted Answer

A)  Compared with other WAN platforms, service costs of Carrier Ethernet are very competitive. 
B)  Carrier Ethernet offers high bandwidth such as 100Gbps. 
C)  Corporate customers can purchase bandwidth incrementally to meet their needs. 
D)  Carrier Ethernet offers flexible WAN design choices, which include point-to-point and multipoint-to-multipoint connections. 
E)  A carrier Ethernet's limitation is that clients are unable to build global scale WAN connections. 
A)  Compared with other WAN platforms, service costs of Carrier Ethernet are very competitive. 
B)  Carrier Ethernet offers high bandwidth such as 100Gbps. 
C)  Corporate customers can purchase bandwidth incrementally to meet their needs. 
D)  Carrier Ethernet offers flexible WAN design choices, which include point-to-point and multipoint-to-multipoint connections. 
E)  A carrier Ethernet's limitation is that clients are unable to build global scale WAN connections.

Question 4

The cloud, as an ISP network, is running on the MPLS (multi-protocol label switching) technology.
  
-Which router(s) need(s) to be MPLS technology-enabled to fast track the packets between the two hosts?

Accepted Answer

A)  All routers 
B)  R1 and R6 only 
C)  R2 and R5 only 
D)  R3 and R4 only 
E)  R2, R3, R4, and R5 only 
A)  All routers 
B)  R1 and R6 only 
C)  R2 and R5 only 
D)  R3 and R4 only 
E)  R2, R3, R4, and R5 only

Question 5

Which correctly orders the level of redundancy from low to high as WAN topologies?

Accepted Answer

A)  hub and spoke - full mesh - partial mesh 
B)  hub and spoke - partial mesh - full mesh 
C)  partial mesh - full mesh - hub and spoke 
D)  full mesh - partial mesh - hub and spoke 
E)  partial mesh - hub and spoke - full mesh 
A)  hub and spoke - full mesh - partial mesh 
B)  hub and spoke - partial mesh - full mesh 
C)  partial mesh - full mesh - hub and spoke 
D)  full mesh - partial mesh - hub and spoke 
E)  partial mesh - hub and spoke - full mesh

Question 6

The packet switched data network (PSDN) runs on following technology standards EXCEPT

Accepted Answer

A)  Frame-Relay 
B)  Carrier Ethernet 
C)  Multi-Protocol Label Switching 
D)  Asynchronous Transfer Mode 
E)  Point-to-Point (PPP) 
A)  Frame-Relay 
B)  Carrier Ethernet 
C)  Multi-Protocol Label Switching 
D)  Asynchronous Transfer Mode 
E)  Point-to-Point (PPP)

Question 7

SONET and T-carrier (e.g., T-1) standards are defined at the ________ layer.

Accepted Answer

A)  data link 
B)  transport 
C)  physical 
D)  network 
E)  session 
A)  data link 
B)  transport 
C)  physical 
D)  network 
E)  session

Question 8

Choose the LEAST accurate statement.

Accepted Answer

A)  In circuit switching, transmission capacity is guaranteed/reserved between two points. 
B)  Packet switching generally guarantees network performance (ex. speeds). 
C)  Packet switching service only charges a customer for the capacity actually used. 
D)  Packets travelling between two end nodes may not take the same delivery path. 
E)  With packet switching, WAN capacity can be dynamically shared by customers. 
A)  In circuit switching, transmission capacity is guaranteed/reserved between two points. 
B)  Packet switching generally guarantees network performance (ex. speeds). 
C)  Packet switching service only charges a customer for the capacity actually used. 
D)  Packets travelling between two end nodes may not take the same delivery path. 
E)  With packet switching, WAN capacity can be dynamically shared by customers.

Question 9

What is a popular data link protocol introduced for end-to-end leased lines?

Accepted Answer

A)  PPP (Point-to-Point) 
B)  Frame Relay 
C)  ATM (Asynchronous Transfer Mode) 
D)  Carrier Ethernet 
E)  MPLS (Multi-Protocol Label Switching) 
A)  PPP (Point-to-Point) 
B)  Frame Relay 
C)  ATM (Asynchronous Transfer Mode) 
D)  Carrier Ethernet 
E)  MPLS (Multi-Protocol Label Switching)

Question 10

The service level agreement (SLA) for a WAN service may include following terms EXCEPT:

Accepted Answer

A)  Penalty provisions for service failures 
B)  LAN topology of a client's enterprise network 
C)  Data rate (speed) of a subscribed WAN service 
D)  Latency (ex. round-trip transmission delay) and how it is measured 
E)  Availability of network service and its calculation method 
A)  Penalty provisions for service failures 
B)  LAN topology of a client's enterprise network 
C)  Data rate (speed) of a subscribed WAN service 
D)  Latency (ex. round-trip transmission delay) and how it is measured 
E)  Availability of network service and its calculation method

Question 11

Imagine WAN connections of an enterprise network running on the AT&T's PSDN as follows.
  
-What IP address-Virtual Circuit mapping information would R1 need to maintain to deliver packets to R2 and R3?
$\begin{array}{|ll|c|}
\hline &{\text { IP address of }} & \text {Virtual circuit} \

&{\text { Destination Routers }} & \text { Identifier } \
\hline \text { (1) } & 10.10 .10 .2 & \text { VC1 } \
\text { (2) } & 10.10 .10 .2 & \text { VC2 } \
\text { (3) } & 172.16 .10 .2 & \text { VC3 } \
\text { (4) } & 172.16 .10 .2 & \text { VC4 } \
\text { (5) } & 192.168 .10 .1 & \text { VC5 } \
\text { (6) } & 192.168 .10 .1 & \text { VC6 } \
\hline
\end{array}$

Accepted Answer

A)  (1) and (2) 
B)  (1) and (3) 
C)  (1), (3), and (5) 
D)  (1), (2), (3), and (4) 
E)  (1), (2), (3), (4), (5) and (6) 
A)  (1) and (2) 
B)  (1) and (3) 
C)  (1), (3), and (5) 
D)  (1), (2), (3), and (4) 
E)  (1), (2), (3), (4), (5) and (6)

Question 12

Frames produced by the ATM standard are known as:

Accepted Answer

A)  packets 
B)  cells 
C)  clusters 
D)  virtual circuits 
E)  segments 
A)  packets 
B)  cells 
C)  clusters 
D)  virtual circuits 
E)  segments

Question 13

Imagine WAN connections of an enterprise network running on the AT&T's PSDN as follows.
  
-What is a right entry of the IP address-Virtual Circuit mapping table on R1?
$$\begin{array} { | l c | c | c | } 
\hline & \begin{array} { c } 
\text { IP address of } \
\text { Destination Routers }
\end{array} & \begin{array} { c } 
\text { Virtual circuit } \
\text { identifier }
\end{array} & \begin{array} { c } 
\text { Exit interface } \
\text { (or sub-interface) }
\end{array} \
\hline \text { A) } & 10.10 .10 .2 & \mathrm { VC } 1 & \mathrm {~S} 0 / 0 / 0.10 \
\text { B) } & 172.16 .10 .0 / 24 & \mathrm { VC } 3 & \mathrm {~S} 0 / 0 / 0.20 \
\text { C) } & 10.10 .10 .2 / 24 & \mathrm { VC } 1 & \mathrm {~S} 0 / 0 / 0 \
\text { D) } & 172.16 .10 .2 & \mathrm { VC } 3 & \mathrm {~S} 0 / 0 / 0 \
\text { E) } & 10.10 .10 .0 / 24 & \mathrm { VC } 1 & \mathrm {~S} 0 / 0 / 0.10 \
\hline
\end{array}$$

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Which of these is NOT considered as customer premises equipment (CPE) in WAN connectivity?

Choose an INCORRECT statement on WAN links (do not count the Internet here).

Which of the following is INCORRECT in describing Carrier Ethernet?

The cloud, as an ISP network, is running on the MPLS (multi-protocol label switching) technology. -Which router(s) need(s) to be MPLS technology-enabled to fast track the packets between the two hosts?

Which correctly orders the level of redundancy from low to high as WAN topologies?

The packet switched data network (PSDN) runs on following technology standards EXCEPT

SONET and T-carrier (e.g., T-1) standards are defined at the ________ layer.

Choose the LEAST accurate statement.

What is a popular data link protocol introduced for end-to-end leased lines?

The service level agreement (SLA) for a WAN service may include following terms EXCEPT:

Frames produced by the ATM standard are known as:

Networking: Fundamental Concepts

Cybersecurity: Fundamentals

Essential Layers of Computer Networking

Ip Address Planning and Management

Intermediary Devices

Wi-Fi and Cellular Network

Ethernet Lan

Cybersecurity: Threats

Cybersecurity: Network and Host Protection

Cybersecurity: Data Protection

Fundamentals of Packet Routing

Physical Layer Data Transmissions

Enterprise Network: LAN Topology, Routing, and Connectivity

Filters

Exam 12: Wide Area Network

Which of these is NOT considered as customer premises equipment (CPE) in WAN connectivity?

Choose an INCORRECT statement on WAN links (do not count the Internet here).

Which of the following is INCORRECT in describing Carrier Ethernet?

The cloud, as an ISP network, is running on the MPLS (multi-protocol label switching) technology. -Which router(s) need(s) to be MPLS technology-enabled to fast track the packets between the two hosts?

Which correctly orders the level of redundancy from low to high as WAN topologies?

The packet switched data network (PSDN) runs on following technology standards EXCEPT

SONET and T-carrier (e.g., T-1) standards are defined at the ________ layer.

Choose the LEAST accurate statement.

What is a popular data link protocol introduced for end-to-end leased lines?

The service level agreement (SLA) for a WAN service may include following terms EXCEPT:

Frames produced by the ATM standard are known as:

Networking: Fundamental Concepts

Cybersecurity: Fundamentals

Essential Layers of Computer Networking

Ip Address Planning and Management

Intermediary Devices

Wi-Fi and Cellular Network

Ethernet Lan

Cybersecurity: Threats

Cybersecurity: Network and Host Protection

Cybersecurity: Data Protection

Fundamentals of Packet Routing

Physical Layer Data Transmissions

Enterprise Network: LAN Topology, Routing, and Connectivity

Filters