CCNA 4 Exploration – Chapter 7

August 18, 2009

Chapter 7 – Correct Answers

Which options are properties of contention-based media access for a shared media? (Choose three.)

> non-deterministic
> less overhead
> collisions exist

What is a primary purpose of encapsulating packets into frames?

> facilitate the entry and exit of data on media

Refer to the exhibit. How many unique CRC calculations will take place as traffic routes from the PC to the laptop?

>8

What is true concerning physical and logical topologies?

> Logical topologies consist of virtual connections between nodes.

Refer to the exhibit. Assuming that the network in the exhibit is converged meaning the routing tables and ARP tables are complete, which MAC address will Host A place in the destination address field of Ethernet frames destined for http://www.server?

> 00-0c-85-cf-65-c0

What are three characteristics of valid Ethernet Layer 2 addresses? (Choose three.)

> They are 48 binary bits in length.
> They are generally represented in hexadecimal format.
> They are considered physical addresses.

Refer to the exhibit. A frame is being sent from the PC to the laptop. Which source MAC and IP addresses will be included in the frame as it leaves RouterB? (Choose two.)

> source MAC – Fa0/1 on RouterB
> source IP – PC

What determines the method of media access control? (Choose two.)

> media sharing
> logical topology

What is the purpose of the preamble in an Ethernet frame?

> is used for timing synchronization with alternating patterns of ones and zeros

What statements are true regarding addresses found at each layer of the OSI model? (Choose two.)

> Layer 2 may identify devices by a physical address burned into the network card
> Layer 3 represents a hierarchical addressing scheme

Which statements describe the logical token-passing topology? (Choose two.)

> Computers are allowed to transmit data only when they possess a token.
> Electronic tokens are passed sequentially to each other.

Which sublayer of the data link layer prepares a signal to be transmitted at the physical layer?

> MAC

What is true regarding media access control? (Choose three.)

> Ethernet utilizes CSMA/CD
> defined as placement of data frames on the media
> Data Link layer protocols define the rules for access to different media

What is a characteristic of a logical point-to-point topology?

> The media access control protocol can be very simple.

What two facts are true when a device is moved from one network or subnet to another? (Choose two.)

> The device will still operate at the same Layer 2 address.
> The Layer 3 address must be reassigned to allow communications to the new network.

What is a function of the data link layer?

> provides for the exchange data over a common local media

Which three factors should be considered when implementing a Layer 2 protocol in a network? (Choose three.)

> the geographic scope of the network
> the physical layer implementation
> the number of hosts to be interconnected

What is the primary purpose of the trailer in a data link layer frame?

> support frame error detection

A network administrator has been asked to provide a graphic representation of exactly where the company network wiring and equipment are located in the building. What is this type of drawing?

> physical topology

Refer to the exhibit. Which statement describes the media access control methods that are used by the networks in the exhibit?

> Network 1 uses CSMA/CD and Network 3 uses CSMA/CA.

Additional Questions 

What is true concerning physical and logical topologies?

> Logical topologies consist of virtual connections between nodes.

22.

Refer to the exhibit. How many CRC calculations will take place as traffic routes from the PC to the laptop?

> 8

CCNA 4 Exploration – Chapter 4

August 18, 2009

Chapter 4 – Correct Answers

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

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

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

> A termination request has been sent to 192.135.250.10.
> Communication with 64.100.173.42 is using HTTP Secure.

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.

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

> 0 to 1023

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

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

> transport

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

Why is flow control used for TCP data transfer?

> to prevent the receiver from being overwhelmed by incoming data

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

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

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

> session establishment

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

> source port

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

> low overhead
> connectionless

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

> window size

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

> UDP

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

> source and destination

Which three features allow TCP to reliably and accurately track the transmission of data from source to destination?

> flow control
> session establishment
> numbering and sequencing

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.

Which is an important characteristic of UDP?

> minimal delays in data delivery

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

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

> TCP initializes the sequence numbers for the sessions.

Exhibit item:

1

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.

CCNA 4 Exploration – Chapter 3

August 18, 2009

CHAPTER 3 – Correct Answers

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

> FTP

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

> Application
> Services

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

What is the purpose of resource records in DNS?

> Used by the server to resolve names

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

> DNS

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

> DNS
> SMTP
> POP

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

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

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

> MTA
> SMTP

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

> Does not support encryption

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

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

> HTTP
> HTTPS

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.

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

> Application

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

> 80

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

> Decentralized resources
> Resource sharing without a dedicated server

What application layer protocol describes the services that are used for file sharing in Microsoft networks? (Be careful its asking in Microsoft network)

> SMB

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

> initiate data exchanges
> may upload data to servers

What is the role of the OSI application layer?

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

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

ls. ( k s Punbr>
> define the structure of layer specific PDU’s
> outline the functions necessary for communications between layers
> require layer dependent encapsulations

What are the key functions of encapsulation? (Choose three.)

> identifies pieces of data as part of the same communication
> ensures that data pieces can be directed to the correct receiving end device
> enables the reassembly of complete messages

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

> supports error detection

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

> Physical
> Data Link

What is a PDU?

> a layer specific encapsulation

Which characteristic correctly refers to end devices in a network?

> originate data flow

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

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

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.

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

> multiplexing

What is the primary purpose of Layer 4 port assignment?

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

What device is considered an intermediary device?

> Switch

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

> intermediary

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

> LAN

Which layer encapsulates the segment into packets?

> network

What can be identified by examining the network layer header?

> the destination host address

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

> E, F, H, I, J

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

> The physical address is added.

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

> detailing the components that make up the physical link and how to access it

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

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CCNA 4 Exploration – Chapter 2

August 18, 2009

CHAPTER 2 – Correct Answers
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

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

What are the key functions of encapsulation? (Choose three.)

> identifies pieces of data as part of the same communication
> ensures that data pieces can be directed to the correct receiving end device
> enables the reassembly of complete messages

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

> supports error detection

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

> Physical
> Data Link

What is a PDU?

> a layer specific encapsulation

Which characteristic correctly refers to end devices in a network?

> originate data flow

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

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

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.

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

> multiplexing

What is the primary purpose of Layer 4 port assignment?

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

What device is considered an intermediary device?

> Switch

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

> intermediary

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

> LAN

Which layer encapsulates the segment into packets?

> network

What can be identified by examining the network layer header?

> the destination host address

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

> E, F, H, I, J

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

> The physical address is added.

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

> detailing the components that make up the physical link and how to access it

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

100% Result Granted!


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