Chapter 7

Which OSI layer creates and processes frames?

Data Link

Which layer of the OSI model does Project 802 divide into sublayers? Network and Data Link Data Link Physical Network Data Link and Physical

Data Link

At what later do NICs operate? Network Transport All of these choices Physical Data Link

Data link

Which layer has been subdivided into the Logical Link Control sublayer and the Media Access Control sublayer? Network Physical Data Link Internetwork Transport

Data link

The addition of information to a PDU as it's passed from one layer to the next is called which of the following? Fragmentation Segmentation Deencapsulation All of these choices Encapsulation

Encapsulation

(T or F) One shortcoming of the OSI Reference Model is that it does not provide a common framework to work with and learn from.

False

(T or F) The Network layer communicates with the Data Link layer and the Session Layer

False

(T or F) The Physical layer has been divided into two sublayers, called the LLC sublayer and the MAC sublayer.

False

(T or F) When the Data Link layer receives a frame, it first calculates the CRC and compares it to the incoming frame's CRC to make sure that the values are the same.

False

(T or F) The PDU at the Transport layer is data.

False - Segment

(T or F) The Media Access Control (MAC) sublayer defines the use of logical interface points, called Service Access Points (SAPs).

False, The LLC of the Data Link layer defines the use

The Protocol Data Unit (PDU) at the Data Link layer is called a(n) ___________.

Frame

Which of the following is a protocol found at the Network layer? IP SNMP ICMP Ethernet ARP

IP, ICMP, ARP

The two sublayers of the Data Link layer are the _____ and media access control (MAC).

Logic Link Control

Which sublayer defines the use of logical interface points, called Service Access Points (SAPs)?

Logical Link Control (LLC)

The segmenting of the data is important because every network technology has a maximum frame size called the _____________________________.

Maximum Transmission Unit

Which is the IEEE standard that sets the standards for wireless (Wi-Fi) networking? 802.22 None of these choices 802.16 802.3 802.15

None of these choices - 802.11

Which IEEE 802 standard applies to Ethernet? 802.5 802.4 802.2 802.11 None of these choices

None of these choices - 802.3

At which Data Link sublayer does the physical address reside? Network Access Control (NAC) Physical None of these choices Logical Link Control (LLC) Data Access Control (DAC)

None of these choices - MAC

The Transport layer segments data into smaller chunks, the size of which is determined by which of the following? MSS LLC PDU TCP None of these choices

None of these choices - MTU

_____ communication refers to the way that each layer on a transmitting computer communicates with the same layer on the receiving computer, just as though they were in direct contact.

Peer

The ____________ layer of the OSI model is the bottom layer, and its job is to convert bits into signals and vice versa.

Physical

Which layer of the OSI model is responsible for encryption and decryption? Presentation All of these choices Session Transport Application

Presentation

Which of the following protocols are found at the Application layer of the OSI model? (Choose all that apply.) SNMP ARP FTP TCP ICMP DHCP

SNMP, FTP, DHCP

What's the name of the protocol data unit (PDU) at the Transport layer? Fragment All of these choices Packet Frame Segment

Segment

What does the Transport layer use to make sure that a message is reassembled correctly on the receiving device? Destination port number Acknowledgement Sequence number Window size Source port number

Sequence number

Which OSI layer handles flow control, data segmentation, and reliability? Network Transport Physical Session Data Link

Transport

(T or F) In a layered approach, each layer is only responsible for a specific task instead of the end-to-end communication.

True

(T or F) In the IEEE 802 standards, each number after the dot represents a different technology or subset of a technology.

True

(T or F) One of the problems that can occur in the Network layer is the incorrect configuration of a hosts IP address

True

(T or F) Peer communication between layers means that each layer on the receiving computer sees network data in the same format its counterpart on the sending computer did.

True

(T or F) The "802" in the IEEE 802 standard represents the year and the month that the project began—February of 1980.

True

(T or F) The IEEE felt the need to develop LAN standards to ensure that network interfaces and cabling from multiple manufacturers would be compatible.

True

(T or F) The PDU for the Application, Presentation, and Session layers is data.

True

(T or F) The Transport Layer is the same in both the OSI model and the TCP\IP

True

(T or F) The maximum transmission unit for Ethernet is 1500 bytes plus an additional 18 bytes of header\trailer.

True

The _____ size is a negotiated amount between the transmitting and receiving devices that sets the amount of data that can be transferred before an acknowledgement must be sent and received.

Window

What information would you find in the header of a Transport layer PDU? Destination IP address Cyclic redundancy check Source MAC address Window size All of these choices

Window size

The original commercial version of Ethernet supported 10 Mbps bandwidth, the version introduced in the early 1990s supports 100 Mbps, and in 1998, Gigabit Ethernet was introduced. All versions use the same data frame formats, with the same maximum PDU sizes, so they can interoperate freely. Given this information and what you know of layered technologies, which of the following statements is true? (Choose all that apply.) -Ethernet works at the Data Link and Physical layers of the OSI model, and upgrades to newer, faster versions of Ethernet can be made by changing only the components that work at these layers -Ethernet is not considered a scalable technology -Changes in technology at one later of the OSI model don't usually affect the operation of other layers -Ethernet spans several layers and requires a new protocol stack to upgrade to new versions

-Ethernet works at the Data Link and Physical layers of the OSI model, and upgrades to newer, faster versions of Ethernet can be made by changing only the components that work at these layers. -Changes in technology at one later of the OSI model don't usually affect the operation of other layers

What are the names of the sublayers specified as part of Project 802? -Logical Link Control (LLC) -Media Access Control (MAC) -Physical -Data Link Control(DLC) -Carrier Sense Multiple Access\Collision Detection (CSMA\CD)

-Logical Link Control (LLC) -Media Access Control (MAC)

Which of the following elements might the Data Link layer add to its PDU? -Time-to-Live -Physical addresses -CRC -Port numbers -Sequence number

-Physical address -CSC

Put the following layers of the OSI model in the proper numeric order:

1- Physical 2- Data Link 3- Network 4- Transport 5- Session 6- Presentation 7- Application

Which OSI layer is responsible for setting up, maintaining, and ending ongoing information exchanges across a network? 2 1 4 3 5

5

One job that a router performs is that of gatekeeper, which means that it can be configured to only allow certain packets access into the network based on a list of rules. What is that process called? Media control Signal bounce Pack forwarding Access control

Access control

How can you find out what your MAC address is? -Open a command prompt and type the command ipconfig \all -Open a command prompt and type the command getmac -Issue the netstat -r command -Open a command prompt and type the command arp -d -Right-click on the Local Area Connection and choose status

All of these choices

Match the layers of the OSI model with their counterparts in the TCP\IP model.

Application, Session, and Presentation are all Application Transport is Transport Network is Internetwork Data Link and Physical are Network Access