ENetwork Chapter 5

1   
What is a component of a routing table entry?

•     the next-hop address

2   

Refer to the exhibit. The network in the exhibit is fully operational. What two statements correctly describe the routing for the topology that is shown? (Choose two.)

•     192.168.0.2 is the next-hop address that is used by R3 to route a packet from the 10.0.0.0 network to the 172.16.0.0 network.
•     192.168.0.1 is the next-hop address that is used by R2 to route a packet from the 172.16.0.0 network to the 192.168.12.0 network.

   
3   
What is the purpose of a default gateway?

•     identifies the device that allows local network computers to communicate with devices on other networks

4   

Refer to the exhibit. All devices shown in the exhibit have factory default settings. How many broadcast domains are represented in the topology that is shown?

•     4

   
5   
Which intermediary devices could be used to implement security between networks? (Choose two.)

•     router
•     firewall

   
6   
What are three common problems with a large network? (Choose three.)

•     performance degradation
•     security issues
•     host identification

   
7   

Refer to the exhibit. Using the network in the exhibit, what would be the default gateway address for host A in the 192.133.219.0 network?

•     192.133.219.1

   
8   

Refer to the exhibit. A network administrator notices that there are too many broadcasts on the network. What two steps can the network administrator take to resolve this problem? (Choose two.)

•     Replace S2 with a router.
•     Subnet the 192.168.0.0 /24 network.

   
9   
What two characteristics are commonly associated with dynamic routing protocols? (Choose two.)

•     provide routers with up-to-date routing tables
•     consume bandwidth to exchange route information

   
10   
In an IPv4 environment, what information is used by the router to forward data packets from one interface of a router to another?

•     destination network address

   
11   

Refer to the exhibit. A network administrator is troubleshooting a connectivity problem and needs to determine the address that is used to forward network packets out the network. Using the netstat -r command, the administrator would identify which address as the address to which all hosts send packets that are destined for an outside network?

•     10.10.10.6

   
12   
Which portion of the network layer address does a router use to forward packets?

•     network portion

   
13   
What information is added during encapsulation at OSI Layer 3?

•    source and destination IP address

14   
Which three statements are true about routes and their use? (Choose three.)

•     If the destination network is directly connected, the router forwards the packet to the destination host.
•     If no route exists for the destination network and a default route is present, the packet is forwarded to the next-hop router.
•     If the originating host has a default gateway configured, the packet for a remote network can be forwarded using that route.

   
15   
What statement describes the purpose of a default route?

• A host uses a default route to transfer data to a host outside the local network when no other route to the destination exists.

16   
When the destination network is not listed in the routing table of a Cisco router, what are two possible actions that the router might take? (Choose two.)

•     The router discards the packet.
•     The router forwards the packet out the interface indicated by the default route entry.

17   
In a connectionless system, which of the following is correct?

•     The destination is not contacted before a packet is sent.

   
18   
If the default gateway is configured incorrectly on the host, what is the impact on communications?

•     The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.

   
19   
What are the key factors to consider when grouping hosts into a common network? (Choose three.)

•     purpose
•     geographic location
•     ownership

20   
Which IP packet field will prevent endless loops?

•     time-to-live

   
21   
What type of routing uses information that is manually entered into the routing table?

•     static

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ENetwork Chapter 4

1
Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process, Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data. What action will Server 1 take as a result?

•     reach a timeout and resend the data that needs to be acknowledged

   
2   
Which information is found in both the TCP and UDP header information?

•    source and destination port

3   
After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of the response from the server?

•     80

   
4   
With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?

•     0 to 1023

   
5   
Which three features allow TCP to reliably and accurately track the transmission of data from source to destination? (Choose three.)

•     flow control
•     session establishment
•     numbering and sequencing

6  

Refer to the exhibit. What two pieces of information can be determined from the output that is shown? (Choose two.)

•     The local host is using three client sessions.
•     The local host is using web sessions to a remote server.

   
7   

Based on the transport layer header shown in the diagram, which of the following statements describe the established session? (Choose two.)

•     This contains a Telnet request.
•     This is a TCP header.

8   
What are two features of the User Datagram Protocol (UDP)? (Choose two.)

•     low overhead
•     connectionless

   
9   
What is dynamically selected by the source host when forwarding data?

•     source port

10   
Why is flow control used for TCP data transfer?

•     to prevent the receiver from being overwhelmed by incoming data

   
11   
During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?

•     The packets will be delivered and reassembled at the destination.

   
12   

Refer to the exhibit. Host1 is in the process of setting up a TCP session with Host2. Host1 has sent a SYN message to begin session establishment. What happens next?

•     Host2 sends a segment with the ACK flag = 1, SYN flag = 1 to Host1.

13   
Which two options represent Layer 4 addressing? (Choose two.)

•     identifies the communicating applications
•     identifies multiple conversations between the hosts

   
14   
Which event occurs during the transport layer three-way handshake?

•     TCP initializes the sequence numbers for the sessions.

   
15   
Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?

•     transport

16   
Which is an important characteristic of UDP?

•     minimal delays in data delivery

17   
What mechanism is used by TCP to provide flow control as segments travel from source to destination?

•     window size

18   
Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?

•     UDP

19   
Why are port numbers included in the TCP header of a segment?

•     to enable a receiving host to forward the data to the appropriate application

20   

Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being performed?

•     session establishment

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ENetwork Chapter 3

1   
What is the purpose of resource records in DNS?

•     used by the server to resolve names

   
2   
What are two forms of application layer software? (Choose two.)

•     applications
•     services

   
3  

Refer to the exhibit. What is the destination port for the communication that is represented on line 5?

•     80

   
4   
What are two characteristics of peer-to-peer networks? (Choose two.)

•     decentralized resources
•     resource sharing without a dedicated server

5   
What is the automated service that matches resource names with the required IP address?

•     DNS

   
6   
What three protocols operate at the Application layer of the OSI model? (Choose three.)

•     DNS
•     SMTP
•     POP

   
7   
What are three properties of peer-to-peer applications? (Choose three.)

•     acts as both a client and server within the same communication
•     hybrid mode includes a centralized directory of files
•     can be used in client-server networks

   
8   
Which application layer protocols correctly match a corresponding function? (Choose two.)

•     HTTP transfers data from a web server to a client
•     Telnet provides a virtual connection for remote access

9   
A small home network has been installed to interconnect three computers together for gaming and file sharing. What two properties represent this network type? (Choose two.)

•     Security is difficult to enforce.
•     A computer that responds to a file sharing request is functioning as a server.

10   
As compared to SSH, what is the primary disadvantage of telnet?

•     does not support encryption

   
11   
Which statements are correct concerning the role of the MTA in handling email? (Choose three.)

•     receives email from the client's MUA
•     passes email to the MDA for final delivery
•     uses SMTP to route email between servers

   
12   
Which two protocols are used to control the transfer of web resources from a web server to a client browser? (Choose two.)

•     HTTP
•     HTTPS

   
13   
What application layer protocol is commonly used to support for file transfers between a client and a server?

•     FTP

   
14   
Which layer of the OSI model supplies services that allow user to interface with the network?

•     application

   
15   
A network administrator is designing a network for a new branch office of twenty-five users. What are the advantages of using a client-server model? (Choose two.)

•     centralized administration
•     security is easier to enforce

   
16   
Which email components are used to forward mail between servers? (Choose two.)

•     MTA
•     SMTP

   
17   
What application layer protocol describes the services that are used for file sharing in Microsoft networks?

•     SMB

   
18   
What are two characteristics of clients in data networks? (Choose two.)

•     initiate data exchanges
•     may upload data to servers

   
19   
What is the role of the OSI application layer?

•     provides the interface between the applications on either end of the network

20   
How does the application layer on a server usually process multiple client request for services?

•     uses support from lower layer functions to distinguish between connections to the service

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ENetwork Chapter 2

1   

Which three statements best describe a Local Area Network (LAN)? (Choose three.)

•     A LAN is usually in a single geographical area.

•     The network is administered by a single organization.

•     A LAN provides network services and access to applications for users within a common organization.

   

2   

What are two functions of encapsulation? (Choose two.)

•     identifies pieces of data as part of the same communication

•     ensures that data pieces can be directed to the correct receiving end device

3   

What is a primary function of the trailer information added by the data link layer encapsulation?

•     supports error detection

   

4   

Refer to the exhibit. "Cell A" at IP address 10.0.0.34 has established an IP session with "IP Phone 1" at IP address 172.16.1.103. Based upon the graphic, which device type best describes the function of wireless device "Cell A?"

•     an end device

   

5   

Refer to the exhibit. Which three labels correctly identify the network types for the network segments that are shown? (Choose three.)

•     Network B -- WAN
•     Network C -- LAN
•     Network A -- LAN

6   

Which two layers of the OSI model have the same functions as the TCP/IP model Network Access Layer? (Choose two.)

•     Physical
•     Data Link

   

7   

What is the purpose of the TCP/IP Network Access layer?

•     the division of segments into packets

8   

Refer to the exhibit. Which networking term describes the data interleaving process represented in the graphic?

•     multiplexing

   

9   

What can be identified by examining the network layer header?

•     the destination host address

   

10   

Select the statements that are correct concerning network protocols. (Choose three.)

•     define the structure of layer specific PDU's
•     outline the functions necessary for communications between layers
•     require layer dependent encapsulations

11   

Refer to the exhibit. Which term correctly identifies the device type that is included in the area B?

•    intermediary

12   

Which statements correctly identify the role of intermediary devices in the network? (Choose three.)

•     determine pathways for data
•     retime and retransmit data signals
•     manage data flows

   

13   

Refer to the exhibit. What type of network is shown?

•     LAN

   

14   

What is the primary purpose of Layer 4 port assignment?

•     to identify the processes or services that are communicating within the end devices

15   

During the encapsulation process, what occurs at the data link layer?

•     The physical address is added.

   

16   

What is the proper order of the layers of the OSI model from the highest layer to the lowest layer?

•     application, presentation, session, transport, network, data link, physical

   

17   

Refer to the exhibit. Which set of devices contains only end devices?

•     E, F, H, I, J

18   

What is a PDU?

•     a layer specific encapsulation

19   

Which layer encapsulates the segment into packets?

•     network

   

20   

Which characteristic correctly refers to end devices in a network?

•     originate data flow

21   

What device is considered an intermediary device?

•     switch

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