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COSC 3315 Chap 5

True/False
Indicate whether the statement is true or false.
 

 1. 
The Application layer provides a set of interfaces for applications to access networked services, such as networked file transfer, message handling, and database query processing.
 

 2. 
The PDU at the Application layer (and the Presentation and Session layers) is referred to simply as “message.”
 

 3. 
Encoding is the representation of 0s and 1s as a physical signal, such as electrical voltage or a light pulse.
 

 4. 
A packet is the basic unit for network traffic as it travels across the medium.
 

 5. 
The frame’s destination address of a broadcast frame is a value of all binary 0s.
 

 6. 
The IEEE 802 standards predate the OSI reference model.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 7. 
In the OSI reference model, the ____ layer is layer 6.
a.
Data Link
c.
Presentation
b.
Application
d.
Session
 

 8. 
In the OSI reference model, the ____ layer is layer 7.
a.
Physical
c.
Presentation
b.
Application
d.
Session
 

 9. 
In the OSI reference model, the ____ layer is layer 5.
a.
Network
c.
Presentation
b.
Application
d.
Session
 

 10. 
In the OSI reference model, the ____ layer is layer 1.
a.
Physical
c.
Data Link
b.
Application
d.
Session
 

 11. 
In the OSI reference model, the ____ layer is layer 2.
a.
Physical
c.
Data Link
b.
Presentation
d.
Network
 

 12. 
In the OSI reference model, the ____ layer is layer 3.
a.
Physical
c.
Data Link
b.
Transport
d.
Network
 

 13. 
In the OSI reference model, the ____ layer is layer 4.
a.
Session
c.
Data Link
b.
Transport
d.
Network
 

 14. 
Domain Name System (DNS) and NetBIOS name resolution both work in part at the ____ layer.
a.
Session
c.
Presentation
b.
Network
d.
Transport
 

 15. 
____ is the process whereby a device receives a packet destined for another network, determines the best way to get the packet to its destination, and then forwards the packet out of one of its other network interfaces.
a.
Switching
c.
Encapsulation
b.
Routing
d.
Forwarding
 

 16. 
Access control is handled at the ____ layer during the routing process; the router consults a list of rules before forwarding an incoming packet to determine whether a packet meeting certain criteria (such as source and destination address) should be permitted to reach the intended destination.
a.
Data Link
c.
Application
b.
Transport
d.
Network
 

 17. 
The PDU at the Data Link layer is called a ____.
a.
message
c.
frame
b.
segment
d.
packet
 

 18. 
The PDU at the Network layer is called a ____.
a.
message
c.
frame
b.
segment
d.
packet
 

 19. 
The PDU at the Transport layer is called a ____.
a.
message
c.
frame
b.
segment
d.
packet
 

 20. 
The job of the ____ to convert bits into signals for outgoing messages and signals into bits for incoming messages.
a.
Data Link layer
c.
MAC sublayer
b.
LLC sublayer
d.
Physical layer
 

 21. 
A frame is usually addressed to only one computer and is called a ____ frame.
a.
basic
c.
broadcast
b.
unicast
d.
multicast
 

 22. 
In some cases, special frames called ____ frames are created for all computers on a network.
a.
group
c.
broadcast
b.
unicast
d.
multicast
 

 23. 
____ frames are created for any computers on a network that “listen” to a shared network address.
a.
Group
c.
Broadcast
b.
Unicast
d.
Multicast
 

 24. 
The IEEE standard ____ covers all forms of Ethernet media and interfaces, from 10 Mbps to 10 Gbps (10 Gigabit Ethernet).
a.
802.2
c.
802.5
b.
802.3
d.
802.11
 

 25. 
The IEEE standard ____ covers error control and flow control over data frames.
a.
802.2
c.
802.5
b.
802.3
d.
802.11
 

 26. 
The IEEE standard ____ sets standards for wireless networking for many different broadcast frequencies and techniques.
a.
802.3
c.
802.15
b.
802.11
d.
802.16
 

 27. 
____ functions at the Application layer of the OSI reference model.
a.
UDP
c.
PPP
b.
ARP
d.
HTTP
 

 28. 
____ functions at the Transport layer of the OSI reference model.
a.
PPP
c.
IPX
b.
IP
d.
SPX
 

 29. 
____ functions at the Network layer of the OSI reference model.
a.
PPP
c.
IPX
b.
UDP
d.
SPX
 

Completion
Complete each statement.
 

 30. 
OSI stands for ______________________________.
 

 

 31. 
The OSI reference model was proposed by the _____________________________________________ (ISO).
 

 

 32. 
PDU stands for ____________________.
 

 

 33. 
The trailer component labeled as“FCS” (frame check sequence) contains an error-checking value called a(n) _________________________ (CRC).
 

 

 34. 
LLC stands for ____________________.
 

 

 35. 
MAC stands for ____________________.
 

 

Matching
 
 
Match each term with the correct statement below.
a.
Network layer
f.
PDU
b.
Transport layer
g.
redirector
c.
CRC
h.
Presentation layer
d.
Data Link layer
i.
flow control
e.
protocol suite
 

 36. 

 collection of related software elements and services that correspond to the layers of the OSI model, instead of a single massive program
 

 37. 

 passed as a self-contained data structure from one layer to another on its way up or down the protocol stack
 

 38. 

 handles data-formatting information for network communications
 

 39. 

 operates at the presentation layer
 

 40. 

 manages the transfer of data from one application to another across a network
 

 41. 

 handles addressing messages for delivery and translates logical addresses into their physical counterparts
 

 42. 

 ensures that the recipient of transmitted data isn’t overwhelmed with more data than it can handle
 

 43. 

 sends PDUs from the Network layer to the Physical layer
 

 44. 

 its value is the result of a mathematical function based on data in the frame and is recalculated on the receiving end
 



 
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