NETLAB | Lab 1: The OSI Model | Review Questions and
Answers
data
What is the PDU associated with the top three layers of the OSI model?
request (GET)
What HTTP message type is used to request data?
response (OK)
What HTTP message type was used to signify the image was successfully transferred
to the client?
49157
In Section 3.1, Step 2a, what is the source port for the conversation?
80
In Section 3.1, Step 2b, what is the Well Known Port number for the HTTP protocol?
Segment 1: SYN
Segment 2: SYN-ACK
Segment 3: ACK
Identify which flags are set in each segment of the three-way handshake.
dynamic
The port number 49157 is known as this type of port because it is randomly generated
when the conversation is initiated.
well known
The port number 80 is known as this type of port because it is assigned to the HTTP
protocol by IANA.
121 bytes
If the IP header is 20 bytes, how big is the TCP segment encapsulated by this header?
20 bytes
What is the typical length of an IP header?
router
What device decreases the TTL value whenever a packet traverses it?
packet
What is the PDU associated with the network layer of the OSI model?
48
How long is a MAC address in bits?
6
How long is a MAC address in bytes?
Organizationally Unique Identifier (OUI)
What is the first half of a MAC address known as?
ipconfig /all
What command can be used on a Windows machine to view the MAC address?
bits
What is the PDU associated with the physical layer of the OSI model?
true
True or false - a bad cable is considered a physical layer issue?
false
Answers
data
What is the PDU associated with the top three layers of the OSI model?
request (GET)
What HTTP message type is used to request data?
response (OK)
What HTTP message type was used to signify the image was successfully transferred
to the client?
49157
In Section 3.1, Step 2a, what is the source port for the conversation?
80
In Section 3.1, Step 2b, what is the Well Known Port number for the HTTP protocol?
Segment 1: SYN
Segment 2: SYN-ACK
Segment 3: ACK
Identify which flags are set in each segment of the three-way handshake.
dynamic
The port number 49157 is known as this type of port because it is randomly generated
when the conversation is initiated.
well known
The port number 80 is known as this type of port because it is assigned to the HTTP
protocol by IANA.
121 bytes
If the IP header is 20 bytes, how big is the TCP segment encapsulated by this header?
20 bytes
What is the typical length of an IP header?
router
What device decreases the TTL value whenever a packet traverses it?
packet
What is the PDU associated with the network layer of the OSI model?
48
How long is a MAC address in bits?
6
How long is a MAC address in bytes?
Organizationally Unique Identifier (OUI)
What is the first half of a MAC address known as?
ipconfig /all
What command can be used on a Windows machine to view the MAC address?
bits
What is the PDU associated with the physical layer of the OSI model?
true
True or false - a bad cable is considered a physical layer issue?
false
