Deck 14: Enterprise Network: LAN Topology, Routing, and Connectivity

Question 1

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-How many broadcast domains do you see in the "Main office" LAN?

A) 1
B) 2
C) 3
D) 4
E) 5

Answer 1

B

Question 2

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-How many collision domains do you see in the Branch 3 network?

A) 1
B) 2
C) 3
D) 4
E) 5

Answer 2

D

Question 3

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.


-Assume that SW1 connects to the printer, database server, hub, and the R1's Fa0/0 through the ports of Fa0/0, Fa0/1, Fa0/2, and Fa0/3 respectively. Which entry may NOT be listed in the SW1's switch table?
$\begin{array}{llcc} \text { MAC address } & \text { Exit port } \\A. 11-11-11-77-77-77 & \mathrm{Fa} 0 / 0 \\B. 11-11-11-33-33-33 & \mathrm{Fa} 0 / 1 \\C. 11-11-11-22-22-22 & \mathrm{Fa} 0 / 2 \\D. 11-11-11-99-99-99& \mathrm{Fa} 0 / 3 \\\end{array}$

A) A
B) B
C) C
D) D
E) All of the above should be listed.

Answer 3

All of the above should be listed.

Question 4

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-The four geographical locations (3 Branches and Main office) of the enterprise network are interconnected in ________ topology (Do not consider the ISP links).

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

Question 5

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-How many trunk links are there in the "Main office" LAN? LAN? Links between SW5 and SW6 are counted as two separate links.

A) 1
B) 2
C) 3
D) 4
E) 5

Question 6

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-How many subnetworks are in the enterprise network? Exclude network links to the ISP.

A) 10
B) 9
C) 8
D) 4
E) 1

Question 7

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-How many layer 2 links can be formed from Laptop 1?

A) 1
B) 2
C) 3
D) 4
E) 5

Question 8

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-The Branch2 LAN of the enterprise network uses ________ topology (Do not include the border router R2 as part of the topology).

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

Question 9

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-If PC5 sends a frame to PC1, what are the source and the destination addresses included in the header of the FRAME arriving at PC1?

A) Source: 11-11-11-66-66-66, Destination: 11-11-11-22-22-22
B) Source: 11-11-11-66-66-66, Destination: 100.20.30.10
C) Source: 100.20.50.10, Destination: 11-11-11-22-22-22
D) Source: 11-11-11-99-99-99, Destination: 11-11-11-22-22-22
E) Source: MAC address of SW1 port connecting Hub Destination: 11-11-11-22-22-22

Question 10

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-If PC3 transmits an IP packet to the Database Server via R3 and R1, how many different data link source addresses are used before the packet arrives at the Database Server? (Assume that a WAN link also needs a data link address.)

A) 1
B) 2
C) 3
D) 4
E) 5

Question 11

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-When Laptop 1 communicates with the Web server through R3 and R4, which network nodes use their transport layer protocol(s)?

A) Laptop 1 and Web server
B) Laptop 1 only
C) Web server only
D) Laptop 1, R3, and R4
E) Laptop 1, R3, R4 and Web server

Question 12

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-If Laptop1 sends a packet to PC1 through R3 and R1, how many different frames are formed during the transmission from the source to the destination? (WiFi and Ethernet use two different frame structures)

A) 1
B) 2
C) 3
D) 4
E) 5

Question 13

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-For the entire enterprise network to be operational, the router (R4) should have at least how many different MAC addresses?

A) 1
B) 2
C) 4
D) 3
E) 5

Question 14

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-If Laptop1 sends a packet to the Database Server, what are the source and destination addresses included in the header of the "PACKET" arriving at the Database Server?

A) Source: 11-11-11-44-44-44, Destination: 11-11-11-33-33-33
B) Source: 100.20.40.10 Destination: 100.20.30.250
C) Source: 100.20.40.10 Destination: 11-11-11-33-33-33
D) Source: 100.20.30.200 Destination: 100.20.30.250
E) Source: 100.20.30.200 Destination: 11-11-11-33-33-33

Question 15

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-The R2's LAN port that connects SW2 has an IP address of 192.168.123.254. What is its binary combination?

A) 11000000.10101000.01111011.11101110
B) 11000000.10101000.01101011.11111110
C) 11010000.10101000.01111011.11111110
D) 11000000.10101000.01111011.11111110
E) 11000000.10100000.01111011.11111110

Question 16

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-How many collision domains do you see in the Branch 1 network?

A) 1
B) 2
C) 3
D) 4
E) 5

Question 17

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-For the entire enterprise network to be operational, the router (R4) should be configured with at least how many different IP addresses?

A) 1
B) 2
C) 3
D) 4
E) 5

Question 18

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-How many access links are there in the 'Branch1'LAN?

A) 2
B) 3
C) 4
D) 5
E) 6

Question 19

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-The following EXCEPT a _______ needs to have an IP address and a MAC (physical or hardware) address coupled in order to access a network.

A) laptop
B) smartphone
C) wireless access point
D) personal computer
E) server computer

Question 20

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-The wireless access point is a type of a _________ .

A) hub
B) transparent bridge
C) translational bridge
D) switch
E) router

Question 21

Imagine an enterprise network that is composed of 3 branch locations and one main office. Each location has its own LAN and the LANs are interconnected by WAN connections. Also, there are two WAN links that provide the Internet access through an ISP. Answer all questions based on the figure.

-If an asymmetric switch with one 1Gbps port and 23 100Mbps ports (total 24 ports) is used to provide higher speed network connectivity to a host, which switch may be a good candidate for it?

A) SW1
B) SW2
C) SW4
D) SW5
E) SW6

Question 22

Imagine an enterprise network, an example of campus network, which is composed of 4 buildings interconnected. Each building has its own LAN and the LANs are interconnected via 4 routers. Also, there is a WAN link that provides Internet access through an ISP. Answer the following questions.

-The ISP wants to use a supernet address in its routing table to summarize the client's subnets. Which is NOT a possible supernet address? Not all subnets in the Figure are given a subnet address. To find a solution, therefore, only count subnet addresses provided.

A) 100.20.0.0/16
B) 100.0.0.0/8
C) 100.20.128.0/17
D) 100.20.196.0/18
E) Both C and D

Question 23

Imagine an enterprise network, an example of campus network, which is composed of 4 buildings interconnected. Each building has its own LAN and the LANs are interconnected via 4 routers. Also, there is a WAN link that provides Internet access through an ISP. Answer the following questions.

-On R4 (Router 4), a default route to the Internet can be added to its routing table by entering:

A) "ip route 0.0.0.0 0.0.0.0 Fa0/0"
B) "ip route 1.1.1.1 1.1.1.1 Fa0/0"
C) "ip route 255.255.255.255 255.255.255.255 Fa0/0"
D) "ip route 0.0.0.0 255.255.255.255 Fa0/0"
E) "ip route 1.1.1.1 255.255.255.255 Fa0/0"

Question 24

Imagine an enterprise network, an example of campus network, which is composed of 4 buildings interconnected. Each building has its own LAN and the LANs are interconnected via 4 routers. Also, there is a WAN link that provides Internet access through an ISP. Answer the following questions.

-The wireless access point (WAP) in Building 3 supports both SISO (single-input single-output) and single-user MIMO (multi-input multi-output), then the WAP must be running the _______ Wi-Fi standard.

A) IEEE802.11g
B) IEEE802.11n
C) IEEE802.11ac
D) IEEE802.11g or IEEE802.11ac
E) Both IEEE802.11G and IEEE802.11n

Question 25

Imagine an enterprise network, an example of campus network, which is composed of 4 buildings interconnected. Each building has its own LAN and the LANs are interconnected via 4 routers. Also, there is a WAN link that provides Internet access through an ISP. Answer the following questions.

-Assuming that the OSPF protocol is activated on all routers (R1 ~ R4), R4 is going to have ______ entries in its routing table. Include one default route, directly connected routes, and dynamic routes in the counting.

A) 4
B) 8
C) 9
D) 11
E) 13

Question 26

Imagine an enterprise network, an example of campus network, which is composed of 4 buildings interconnected. Each building has its own LAN and the LANs are interconnected via 4 routers. Also, there is a WAN link that provides Internet access through an ISP. Answer the following questions.

-______ dynamic route entries in its routing table (Ignore the ISP WAN connection).

A) 4
B) 7
C) 8
D) 9
E) 11

Question 27

Imagine an enterprise network, an example of campus network, which is composed of 4 buildings interconnected. Each building has its own LAN and the LANs are interconnected via 4 routers. Also, there is a WAN link that provides Internet access through an ISP. Answer the following questions.

-Is there any 'link redundancy' that may cause unnecessary network traffic (ex. broadcast storm)?

A) Yes, in Building 1
B) Yes, in Building 2
C) Yes, in Building 3
D) Yes, in Building 4
E) No, there is no link redundancy

Question 28

Imagine an enterprise network, an example of campus network, which is composed of 4 buildings interconnected. Each building has its own LAN and the LANs are interconnected via 4 routers. Also, there is a WAN link that provides Internet access through an ISP. Answer the following questions.

-The LAN design in Building 4 can be considered as __________

A) 2-tier hierarchical topology/design
B) 3-tier hierarchical topology/design
C) flat topology/design
D) point-to-point topology/design
E) bus topology/design

Question 29

Imagine an enterprise network, an example of campus network, which is composed of 4 buildings interconnected. Each building has its own LAN and the LANs are interconnected via 4 routers. Also, there is a WAN link that provides Internet access through an ISP.
The network administrator is going to create data VLANs on the network in Building 4 to put business departments on separate VLANs to improve security. With the VLANs, R4 will perform inter-VLAN routing. The PCs will belong to the following VLANs:
-- PC4 and PC6: Accounting VLAN
-- PC5 and File Server: Human Resource VLAN
-- PC7 and PC8: Marketing VLAN
Answer the following question.
-How many ports of the three switches in Building 4 should be configured as s trunk port?

A) 11
B) 5
C) 6
D) 7
E) 8

Question 30

Imagine an enterprise network, an example of campus network, which is composed of 4 buildings interconnected. Each building has its own LAN and the LANs are interconnected via 4 routers. Also, there is a WAN link that provides Internet access through an ISP.
The network administrator is going to create data VLANs on the network in Building 4 to put business departments on separate VLANs to improve security. With the VLANs, R4 will perform inter-VLAN routing. The PCs will belong to the following VLANs:
-- PC4 and PC6: Accounting VLAN
-- PC5 and File Server: Human Resource VLAN
-- PC7 and PC8: Marketing VLAN
Answer the following question.
-If PC5 accesses files stored on the File Server, how many physical links transport VLAN-tagged frames between the two computers (assume that both links between SW5 and SW6 will be used to transmit files)?

A) 1
B) 2
C) 3
D) 4
E) none