Lab 01: The OSI Model (Review Questions)

What is the PDU associated with the Physical layer of the OSI model?

Bits

What is the PDU associated with the top three layers of the OSI model?

Data

The __________ __________ layer of the OSI model is responsible for physical addressing.

Data Link

True or False A misconfigured IP address is considered a Physical layer issue.

False The Network layer is responsible for logical addressing.

What HTTP message type is used to request data?

GET

The __________ layer of the OSI model is responsible for logical addressing used by routers to move packets between networks.

Network

What HTTP message type was used to signify the image was successfully transferred to the client?

OK

The __________ model provides the basic framework for understanding how traffic moves through a network.

OSI

What is the first half of a MAC address known as?

Organizationally Unique Identifier (OUI) Essentially the manufacturer.

Once the data has reached the __________ layer of the OSI model it is transmitted onto the networking media and sent to the destination host.

Physical

The __________ layer of the OSI model contains all the tangible network components such as cables, connectors, and repeaters.

Physical

Which flags are set in each segment of the three way handshake at: Segment 1: Segment 2: Segment 3:

Segment 1: SYN Segment 2: SYN, ACK Segment 3: SEQ, ACK

__________ numbers are used to keep all TCP segments in the correct order. The first number in the TCP three way handshake is always __________.

Sequence Zero (0)

In the TCP/IP model there are two protocols that reside at the transport layer, __________ and __________.

TCP and UDP

The top three layers of the OSI model (Application, Presentation, Session) are all encompassed into one layer labeled "application" in the ___________ model.

TCP/IP

True or False A bad cable is considered a Physical layer issue.

True

The __________ protocol is responsible for connectionless data transmission, only sends data, and does not send acknowledgements to verify data transmission.

UDP

The port number 80 is known as the __________ port because it is assigned to the HTTP protocol by IANA.

Well Known or destination port

Wireshark is a network protocol analyzer. A network protocol analyzer is used to capture __________ on a network.

data packets

The port number 49157 is known as a __________ port because it is randomly generated when the conversation is initiated.

dynamic

The PDU associated with the Data Link layer is the __________.

frame

Each layer of the OSI model adds information it needs to the data in a process called encapsulation. The information added at each layer usually comes in the form of a ___________ specific to the protocol in use at that layer.

header

What command can be used on a Windows PC to see the MAC address?

ipconfig/all

The PDU associated with the network layer is the __________.

packet

Wireshark runs on a client computer processing every data packet it receives on its network even if the packet is not destined for the client system running Wireshark. A client running in this manner is said to be operating in __________ mode.

promiscuous

The __________ decreases the time to live (TTL) value whenever a packet transverses it?

router

The Transport layer is responsible for breaking down large data into smaller more manageable pieces. In TCP this is known as __________. In UDP this is known as __________.

segmentation datagrams

TCP conversations always start with a __________ that prepares both the server providing the information and the client receiving the information for communication.

three way handshake

The __________ _________ __________ indicates the number of segments that will be sent before acknowledgement is expected.

window size value

What is the typical header length for the IP protocol?

20 bytes

How long is a MAC address in bits?

48 bits

How long is a MAC address in bytes?

6 bytes

What is the Well Known (destination) Port number for the HTTP protocol?

80

What is the source port for the conversation?

A randomly generated number called a dynamic port between 49152 and 65535.

The destination host passes the received data back up through the layers of the OSI model with each layer processing and removing its header via de encapsulation. The process continues up the layers of the OSI model until the receiving host's __________ layer processes the data.

Application