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Question 1
5 out of 5 points Every router implements the network layer Selected Answer: True Answers: (^) True False
Question 2
5 out of 5 points Forwarding refers to the router local action of transferring a packet from an input link to the appropriate output link Selected Answer: (^) True Answers: (^) True False
Question 3
5 out of 5 points A _________________ defines the format and order of messages sent and received among network entities such as clients and servers. Selected Answer: (^) a. protocol Answers: (^) a. protocol b. base station c. router d. switch
Question 4
5 out of 5 points What advantage does a packet-switched network have over a circuit-switched network? Selected Answer: c. It allows better sharing of resources Answers: a. It guarantees a constant transmission rate and a high quality for each connection b. It must establish a connection (a circuit) between the sender and the receiver c. It allows better sharing of resources
d. It is subject to variable delays and possible information loss
Question 5
0 out of 5 points __________ is the major problem of distance vector routing algorithms. Selected Answer: Network topology change Answers: (^) Dynamic route change Path cost increase Count to infinity Network topology change
Question 6
10 out of 10 points The order of the protocol stack in the Internet reference model (from top to bottom) is: Answers Selected Answer
application
application
transport
transport
network
network
link
link
physical
physical
Question 7
0 out of 5 points A computer with an IP address of 172.16.25.8/24 is willing to send a packet to 172.16.25.52/24. Where will the computer send the data packet? Selected Answer: to the gateway Answers: to the gateway to the loop-back interface to everybody in the network
All Answer Choices performed/executed by switches only a network wide action the action of initializing the router a router local action
Question 11
1 out of 5 points Compare and contrast Static routing and Dynamic routing algorithms. Selected Answer: Routing algorithms in the context of networking can be classified variously. The prior classification is based on the building and modification of a routing table. This can be done in two manners statically or dynamically. More precisely these are known as static and dynamic routing respectively. Correct Answer: (^) Several answers are possible. An example is: In static routing algorithms, routes change very slowly over time, often as a result of human intervention (for example, a human manually editing a router’s forwarding table). Dynamic routing algorithms change the routing paths as the network traffic loads or topology change. A dynamic algorithm can be run either periodically or in direct response to topology or link cost changes. While dynamic algorithms are more responsive to network changes, they are also more susceptible to problems such as routing loops and oscillation in routes. Static routing is generally used for small networks and special applications such as stub networks and back-up default routes. Dynamic routing is usually used for large networks, hierarchical networks and possibility of dynamic changes in network topology. Static routing is more secure as it does not send any advertisements. Dynamic routing sends advertisements which is a security vulnerability. Static routing needs little resources. Dynamic routing needs serious resources. Static routing is simple and needs little administrator skills. Dynamic routing is complex and needs advanced administrator skills. ** Dynamic routing algorithms change the routing paths as the network traffic loads or topology change. While dynamic algorithms are more responsive to network changes, they are also more susceptible to problems such as routing loops and oscillation in routes. Dynamic routing is usually used for large networks, hierarchical networks and possibility of dynamic changes in network topology.
Question 12
0 out of 10 points “Data packets delivery is made possible using a destination MAC address, a destination IP address, destination network address, routing tables, and ARP”. Starting from this sentence and assuming the network of Figure- 1 where Host-A is sending a ping request to Host-B, give the steps for delivering the request from the source to the destination. The steps should make clear the relation between the different concepts mentioned in the sentence (i.e. destination MAC address, destination IP address, destination network address, routing tables, ARP ) and how they are used to delivered the request. The first step is already given as example.
NOTE: don't repeat step- 1 in your answer Step 1 (Host-A) : Host-A checks if the destination is in the same network, using the IP address of Host-B and the mask. It finds that it doesn’t, so it forwards the message to the default gateway , i.e. R1. Host-A gets the IP of its default gateway from local configuration. Step 2 (R1): ___________________________________________________________________ Step 3 (R2): ___________________________________________________________________ Selected Answer: Step 2 (R1): 1 - Host - A send the ip address through the router 1 in the same network area. Step 3 (R2): 2 - router 1 will send the IP Address through the router 2 to the destination of Host - B. Correct Answer: Step 2 (R1) : R1 checks the destination network address and finds out it is not directly connected to it. It then checks its routing table to select the best route and find out what is the next hop to use (i.e. R2 in this case). R1 forwards the data to R2. Step 3 (R2): R2 checks the destination network and finds out it is directly connected to it. R2 sends an ARP request to get the MAC address of Host-B. Host-B replies to the ARP request with its MAC address R2 sends the data to Host-B using Host-B MAC address
Question 13
10 out of 10 points Fill the table bellow by choosing the appropriate answer from the list. Distance vector algorithms Link state algorithms Global or decentralized [a1] [b1] Knowledge of topology [a2] [b2] Routers view of the network topology (same or different) [a3] [b3] (Related) Algorithm [a4] [b4] Problem/issue [a5] [b5] Selected Answer: Fill the table bellow by choosing the appropriate answer from the list. Distance vector algorithms Link state algorithms Global or decentralized Decentralized Global
Selected Answer: (^) False Answers: True False
Question 16
1 out of 1 points The device requesting the information is called a Server , while the device responding to the request is called Client. Selected Answer: False Answers: True False
Question 17
1 out of 1 points Application layer protocol identifies the proper application for each communication stream. Selected Answer: (^) False Answers: True False
Question 18
1 out of 1 points Dynamic Host Configuration Protocol (DHCP) distributes what information to clients: Selected Answer: Answers: Physical Address Domain Address Mac Address
Question 19
1.998 out of 3 points Characteristics of User Datagram Protocol (UDP): choose 3 answer Selected Answers: Reliable delivery
Connectionless Unreliable delivery Answers: Stateless protocol Reliable delivery Stateful protocol Connection-oriented Connectionless Unreliable delivery
Question 20
2 out of 2 points Applications requiring TCP: Choose 3 answer Selected Answers: Web browsers Databases Email Clients Answers: Web browsers Live video streaming Voice over IP (V0IP) Telephony Databases Email Clients
