networking chapter 3 and 4

What are two services performed by the data link layer of the OSI model? (Choose two.)

It accepts Layer 3 packets and encapsulates them into frames. It provides media access control and performs error detection.

Which statement correctly describes frame encoding?

It converts bits into a predefined code in order to provide a predictable pattern to help distinguish data bits from control bits.

What is one advantage of using fiber optic cabling rather than copper cabling?

It is able to carry signals much farther than copper cabling.

In fiber optic media, the signals are represented as patterns of

LIGHT

What acronym is used to reference the data link sublayer that identifies the network layer protocol encapsulated in the frame?

LLC

What is true concerning physical and logical topologies?

Logical topologies refer to how a network transfers data between devices.

At which layer of the OSI model would a physical address be encapsulated?

data link layer

What three requirements are defined by the protocols used in network communcations to allow message transmission across a network? (Choose three.)

delivery options message size message encoding

Which logical address is used for delivery of data to a remote network?

destination IP address

Which address does a NIC use when deciding whether to accept a frame?

destination MAC address

What process is used to place one message inside another message for transfer from the source to the destination?

encapsulation

What is contained in the trailer of a data-link frame?

error detection

A network team is comparing topologies for connecting on a shared media. Which physical topology is an example of a hybrid topology for a LAN?

extended star

What method can be used by two computers to ensure that packets are not dropped because too much data is being sent too quickly?

flow control

Which PDU format is used when bits are received from the network medium by the NIC of a host?

frame

Which method of data transfer allows information to be sent and received at the same time?

full duplex

What makes fiber preferable to copper cabling for interconnecting buildings? (Choose three.)

greater distances per cable run limited susceptibility to EMI/RFI greater bandwidth potential

What is the general term that is used to describe a piece of data at any layer of a networking model?

protocol data unit

What are proprietary protocols?

protocols developed by organizations who have control over their definition and operation

What are two reasons for physical layer protocols to use frame encoding techniques? (Choose two.)

to identify where the frame starts and ends to distinguish data bits from control bits

Which is a function of the Logical Link Control (LLC) sublayer?

to identify which network layer protocol is being used

What is a role of the Logical Link Control sublayer?

to mark frames to identify the network layer protocol being carried

What is the function of the CRC value that is found in the FCS field of a frame?

to verify the integrity of the received frame

What is the purpose of the OSI physical layer?

transmitting bits across the local media

Which layer of the OSI model defines services to segment and reassemble data for individual communications between end devices?

transport

Which statement is true about the TCP/IP and OSI models?

The TCP/IP transport layer and OSI Layer 4 provide similar services and functions.

What is a characteristic of a WAN hub-and-spoke topology?

The branch sites are connected to a central site through point-to-point links

A network administrator is designing a new network infrastructure that includes both wired and wireless connectivity. Under which situation would a wireless connection be recommended?

The end-user device needs mobility when connecting to the network.

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.

Refer to the exhibit. The PC is connected to the console port of the switch. All the other connections are made through FastEthernet links. Which types of UTP cables can be used to connect the devices?

1 - rollover, 2 - straight-through, 3 - crossover

What is the maximum possible throughput between the PC and the server?

128 kb/s

What is an advantage of network devices using open standard protocols?

A client host and a server running different operating systems can successfully exchange data.

Refer to the exhibit. HostA is attempting to contact ServerB. Which two statements correctly describe the addressing that HostA will generate in the process? (Choose two.)

A frame with the destination MAC address of RouterA. A packet with the destination IP address of ServerB.

What method is used to manage contention-based access on a wireless network?

CSMA/CA

What three application layer protocols are part of the TCP/IP protocol suite? (Choose three.)

DHCP DNS FTP

Which statement describes an extended star topology?

End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.

A web client is sending a request for a webpage to a web server. From the perspective of the client, what is the correct order of the protocol stack that is used to prepare the request for transmission?

HTTP, TCP, IP, Ethernet

Which three acronyms/initialisms represent standards organizations? (Choose three.)

IEEE IANA IETF

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.

What is an advantage of using standards to develop and implement protocols?

Products from different manufacturers can interoperate successfully.

A network administrator notices that some newly installed Ethernet cabling is carrying corrupt and distorted data signals. The new cabling was installed in the ceiling close to fluorescent lights and electrical equipment. Which two factors may interfere with the copper cabling and result in signal distortion and data corruption? (Choose two.)

RFI EMI

Which type of connector does a network interface card use?

RJ-45

What will happen if the default gateway address is incorrectly configured on a host?

The host cannot communicate with hosts in other networks.

As data travels on the media in a stream of 1s and 0s how does a receiving node identify the beginning and end of a frame?

The transmitting node inserts start and stop bits into the frame.

Refer to the exhibit. What is wrong with the displayed termination?

The untwisted length of each wire is too long.

Why are two strands of fiber used for a single fiber optic connection?

They allow for full-duplex connectivity.

Which statement is correct about network protocols?

They define how messages are exchanged between the source and the destination.

Why are open standards important in the data communications industry?

They enable interoperability between software and hardware from different vendors.

Which statement describes a characteristic of the frame header fields of the data link layer?

They vary depending on protocols.

addressing

This field helps to direct the frame toward its destination.

STP

This type of copper media is used in industrial or similar environments where there is a lot of interference

optical fiber

This type of media is used for high transmission speed and can also transfer data over long distances.

wireless

This type of media provides the most mobility options.

coaxial

Traditionally used for television but can now be used in a network to connect the customer location to the wiring of the customer premises.

Which three layers of the OSI model are comparable in function to the application layer of the TCP/IP model? (Choose three.)

application presentation session

Refer to the exhibit. If Host1 were to transfer a file to the server, what layers of the TCP/IP model would be used?

application, transport, Internet, and network access layers

The term -----indicates the capacity of a medium to carry data and it is typically measured in kilobits per second (kb/s) or megabits per second (Mb/s).

bandwidth

What type of communication will send a message to all devices on a local area network?

broadcast

Which message delivery option is used when all devices need to receive the same message simultaneously?

broadcast

Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?

data link

Which two factors influence the method that is used for media access control? (Choose two.)

how the connection between nodes appears to the data link layer how nodes share the media

A physical topology that is a variation or combination of a point-to-point, hub and spoke, or mesh topology is commonly known as a -----topology.

hybrid

What layer of the TCP/IP protocol model determines the best path through the network?

internet

What type of delivery uses data link layer addresses?

local delivery

What type of message is sent to a specific group of hosts?

multicast

The MAC address of a PC does not change when the PC is moved to a different network because the MAC address is embedded in the ----of the PC.

network interface card NIC

At which layer of the OSI model would a logical address be encapsulated?

network layer

What are two examples of hybrid topologies? (Choose two.)

partial mesh extended star

What is the purpose of protocols in data communications?

providing the rules required for a specific type of communication to occur

What type of cable is used to connect a workstation serial port to a Cisco router console port?

rollover

A network administrator is designing the layout of a new wireless network. Which three areas of concern should be accounted for when building a wireless network? (Choose three.)

security interference coverage area

Which PDU is processed when a host computer is de-encapsulating a message at the transport layer of the TCP/IP model?

segment

One end of the cable is terminated as displayed, and the other end is terminated in accordance with the T568A standard. What type of cable would be created in this manner?

straight-through

What is the definition of bandwidth?

the amount of data that can flow from one place to another in a given amount of time

Which characteristic describes crosstalk?

the distortion of the transmitted messages from signals carried in adjacent wires

Which characteristic describes the default gateway of a host computer?

the logical address of the router interface on the same network as the host computer

What is indicated by the term throughput?

the measure of the bits transferred across the media over a given period of time

What technique is used with UTP cable to help protect against signal interference from crosstalk?

twisting the wires together into pairs