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Enjoy this challenge regarding the OSI model. This quiz maps to many different certification exams including, CCENT, CCNA, A+, N+, and many more! Good luck!

The OSI Model Challenge

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Enjoy this challenge regarding the OSI model. This quiz maps to many different certification exams including, CCENT, CCNA, A+, N+, and many more!

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Question 1

Where are routers classically associated in the OSI model?

A	Physical
B	Data Link
C	Transport
D	Network

Question 1 Explanation:

The router is a Layer 3 (Network) device in the classic definition.

Question 2

What layer of the OSI model features the use of the reliable TCP approach and the connectionless UDP approach?

A	Network
B	Presentation
C	Transport
D	Session

Question 2 Explanation:

The Transport layer features the use of TCP or UDP to provide reliable or unreliable transport.

Question 3

What layer of the OSI model exists above the Transport layer?

A	Session
B	Network
C	Data Link
D	Physical

Question 3 Explanation:

The layers are Physical, Data Link, Network, Transport, Session, Presentation, Application. These are listed from bottom to top.

Question 4

What are the port numbers used by HTTP and HTTPS at the Transport layer? (Choose 2)

A	80
B	23
C	22
D	443
E	69

Question 4 Explanation:

HTTP and HTTPS use 80 and 443 for TCP port numbers.

Question 5

The process of adding information to data at each layer of the OSI model is known as what?

A	Delineation
B	Repudiation
C	Integrity checking
D	Authentication
E	Encapsulation

Question 5 Explanation:

Each layer encapsulates data with control information.

Question 6

What are two popular reasons to use a reference model like OSI? (Choose 2)

A	It ensures reliable transport under normal network conditions
B	It permits equipment from different vendors to communicate (typically)
C	It ensures that a single protocol is relied upon
D	It dictates how physical media must be deployed
E	It aids in network troubleshooting

Question 6 Explanation:

The use of a model can help multiple vendors design equipment that has a chance of working with other vendor equipment. Also, the use of a model can aid in troubleshooting.

Question 7

What is the PDU called at the Datalink Layer of the OSI model?

A	Packet
B	Frame
C	Bit
D	Segment

Question 8

The JPEG format is a classic example of the function at which layer of the OSI model?

A	Datalink
B	Physical
C	Application
D	Presentation

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Here is a query from a current project – enjoy!

You are examining a packet capture from your local network. What two determinations can you make from this output? (Choose 2)

100-105 a. This is a UDP packet
b. This is a TCP packet
c. The target destination is FTP
d. The target destination is HTTP

Correct Answer: b, d

Explanation: Due to its use of reliable transmissions, Transmission Control Protocol (TCP) uses many fields in its packet structure. These include:

source TCP port number
destination TCP port number
sequence number
acknowledgement number
TCP data offset
reserved data
control flags
window size
TCP checksum
urgent pointer
TCP optional data

In contrast, the unreliable User Datagram Protocol (UDP) packets feature these simple fields:

source port number
destination port number
length
checksum

From the destination TCP port number here of 80, you can determine the intended target service is the Hypertext Transfer Protocol (HTTP). Know the following common ports for this exam:

Port Number	TCP or UDP	Protocol
20	TCP	FTP Data
21	TCP	FTP Control
22	TCP	SSH
23	TCP	Telnet
25	TCP	SMTP
53	UDP	DNS
67, 68	UDP	DHCP
69	UDP	TFTP
80	TCP	HTTP
110	TCP	POP3
161	UDP	SNMP
443	TCP	SSL/TLS
514	UDP	Syslog
520	UDP	RIP

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