Download Networking Test 4 Study Guide

Networking Test 4 Study Guide
True/False
Indicate whether the statement is true or false.
____
1. IPX/SPX is considered the protocol suite of the Internet, and it is the most widely used protocol suite in
LANs.
____
2. The Internetwork layer is the layer that handles network configuration and is considered the heart of the
TCP/IP protocol suite.
____
3. The Transport layer uses port numbers to identify the source and destination Application-layer protocol of the
data that it contains.
____
4. The Transport layer is the same in both the OSI model and the TCP/IP model.
____
5. The maximum transmission unit for Ethernet is 1518 bytes.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
6. The Transport layer deals with which unit of information?
a.
b.
c.
d.
____
7. Which of the following is not a function of the Network Access layer?
a.
b.
c.
d.
____
frame
packet
signal
segment
transmits and receives bit signals
delivers packets efficiently
provides a MAC address for the network interface
receives packets form the Internetwork layer and creates the frame
8. In what layer does the NIC operate?
a.
b.
c.
d.
Network Access
Internetwork
Transport
Application
1
Name: ________________________
____
ID: A
9. In which layer does a router operate?
a.
b.
c.
d.
Network Access
Internetwork
Transport
Application
____ 10. Which protocol is responsible for determining the MAC address associated with each IP address and keeping
a table of its results?
a.
b.
c.
d.
MAC
DNS
ARP
NAT
____ 11. TCP establishes a connection with the destination device using which process?
a.
b.
c.
d.
encapsulation
flow control
windowing
three-way handshake
____ 12. Which of the following is not an Application layer protocol?
a.
b.
c.
d.
DNS
TCP
DHCP
SMTP
____ 13. An IP address consists of four octets separated by periods. Which part of this address denotes its class?
a.
b.
c.
d.
first octet
second octet
third octet
fourth octet
____ 14. How many host addresses are available on a Class C network?
a.
b.
c.
d.
254
256
65534
65536
____ 15. What is the decimal equivalent to the binary number 11000001?
a.
b.
c.
d.
97
160
161
193
2
Name: ________________________
ID: A
____ 16. How many bits are in an IPv6 address?
a.
b.
c.
d.
32
48
64
128
____ 17. The last 64 bits of an IPv6 address are the interface identifier. Where is that number derived from?
a. via DHCP
b. a static entry
c. from an ISP
d. the MAC address
____ 18. What is the decimal equivalent to the hexadecimal number D?
a. 13
b. 15
c. 12
d. 10
____ 19. How many bits are available in an IPv6 network for creating subnets when the prefix is /48 and the host ID is
64 bits?
a.
b.
c.
d.
48
16
32
64
____ 20. Which layer is responsible for establishing a connection between the source and destination?
a.
b.
c.
d.
Application
Session
Transport
Presentation
____ 21. Which layer of the OSI model is responsible for encryption and decryption?
a.
b.
c.
d.
Application
Presentation
Session
Transport
____ 22. What is a PDU?
a.
b.
c.
d.
It is an Application layer protocol that handles delivery of messages.
It is a unit of measurement for the maximum amount of data that can be transferred.
It is the name given to the unit of information used by each layer.
It is a Network layer protocol that handles path determination
3
Name: ________________________
ID: A
____ 23. What information would you find in the header of a Transport layer PDU?
a.
b.
c.
d.
destination IP address
cyclic redundancy check
source MAC address
window size
____ 24. At each layer of the OSI model, data is appended to the original message and then sent on to the next lower
layer. What is this process called?
a.
b.
c.
d.
encapsulation
deencapsulation
packetization
checkpointing
____ 25. What does the Transport layer use to make sure that a message is reassembled correctly on the receiving
device?
a.
b.
c.
d.
source port number
window Size
destination port number
sequence number
____ 26. What is the IEEE standard that governs all forms of Ethernet media?
a.
b.
c.
d.
802.11
802.3
802.15
802.2
____ 27. Which is the IEEE standard that sets the standards for wireless networking?
a.
b.
c.
d.
802.16
802.3
802.15
802.11
____ 28. Which layer is responsible for determining the best path a packet should travel across an internetwork?
a.
b.
c.
d.
Network
Transport
Session
Data Link
____ 29. 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?
a.
b.
c.
d.
media control
packet forwarding
access control
signal bounce
4
Name: ________________________
ID: A
____ 30. You are working at the help desk and you get a message that a user cannot access the Internet. You open a
command prompt, ping the workstation’s IP address, and get a response. You ask the user to try the Internet
again. He does so with the same result— no connection. Which type of device is most likely to be the
problem?
a.
b.
c.
d.
Physical layer device
Data Link layer device
Network layer device
Presentation layer device
____ 31. Which layer has been subdivided into the Logical Link Control sublayer and the Media Access Control
sublayer?
a.
b.
c.
d.
Physical
Data Link
Network
Transport
____ 32. What layer is responsible for making sure that the data that it sends and receives is in a format that the
receiving and sending computers can understand?
a.
b.
c.
d.
7
6
5
4
____ 33. At what layer do NICs operate?
a.
b.
c.
d.
Transport
Data Link
Physical
Network
____ 34. Which layer is responsible for the encoding of signals?
a.
b.
c.
d.
3
1
5
7
____ 35. The Transport layer segments data into smaller chunks, the size of which is determined by which of the
following?
a.
b.
c.
d.
MTU
LLC
PDU
TCP
5
Name: ________________________
ID: A
Completion
Complete each statement.
36. An IP address is composed of two parts, one is the ____________ ID and one is the host ID.
37. ____________are sets of rules and procedures that dictate communication and behavior.
38. ___________ is a way of breaking a large address space into more, smaller, address spaces.
39. The four layers of the TCP/IP protocol suite are Application, ____________, Internetwork, and Network
Access.
40. An address that can only be used on the internal network and cannot be used to access the Internet is called a
____________ address.
41. The ____________ reference model is a general framework for networking systems that uses a layered
approach to reduce its complexity.
42. The ____________ layer is the bottom layer, whose job it is to convert bits into signals and vice versa.
43. The process of stripping the header and trailer from a PDU is called ____________.
44. The PDU at the Data Link layer is called a ____________.
45. The ____________ layer of the TCP/IP model combines the top three layers of the OSI model into one layer.
Matching
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
ARP
APIPA
CIDR
DNS
DHCP
IMAP
NAT
POP3
TCP
UDP
____ 46. method of IP addressing that allows more efficient use of IP addresses
6
Name: ________________________
ID: A
____ 47. dynamically configures IP address
____ 48. protocol in which e-mail is downloaded to the host computer
____ 49. Transport layer protocol that is connectionless
____ 50. translates private IP address to public IP address
____ 51. resolves IP address to MAC address
____ 52. Transport layer protocol that is connection-oriented and reliable
____ 53. type of address that is automatically assigned when no DHCP server can be contacted
____ 54. protocol in which only e-mail headers are downloaded to the host until the message is opened
____ 55. resolves computer names to IP addresses
Short Answer
56. What are four tasks or responsibilities of the Internetwork layer?
57. Briefly describe ARP, include the meaning of its acronym and the layer in which it functions.
58. Explain how Tracert uses an ICMP packet and the TTL value to map the path to an IP address.
59. How does TCP provide flow control and reliability?
60. Briefly describe the three-way handshake that TCP uses to establish a connection.
61. What does APIPA stand for, and what does it do?
62. What is the function of DNS, and at which layer does it operate?
63. Briefly describe an IP address.
64. A range of addresses is reserved for private addressing in each class. What are those ranges?
65. What is the difference between TCP and UDP?
66. What are the benefits to using a layered approach?
67. List the layers of the OSI model from the top down, along with their counterparts in the TCP/IP model.
68. Name the PDU at each layer of the OSI model.
69. What does “802” refer to in the IEEE 802 standard?
70. The Transport layer PDU includes a field for window size. What is the “window size”?
7
Name: ________________________
ID: A
71. How does window size provide flow control?
72. What does the Data Link layer do with a frame after it receives it?
73. What is encoding, and where does it take place?
74. In regards to the OSI Reference Model, what is peer communication?
75. What are the sublayers of the Data Link layer, and what do they do?
8
ID: A
Networking Test 4 Study Guide
Answer Section
TRUE/FALSE
1.
2.
3.
4.
5.
ANS:
ANS:
ANS:
ANS:
ANS:
F
T
T
T
T
PTS:
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1
1
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Page 208
Page 213
Page 223
Page 265
Page 270
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1
1
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1
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1
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1
1
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1
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Page 209
Page 213
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Page 214
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Page 224
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Page 232
Page 232
Pages 239-242
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Page 269
Page 268
Page 271
Page 268
Page 271
Page 276
Page 277
Page 272
Page 272
Page 272
Page 278
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Page 274
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MULTIPLE CHOICE
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
ANS:
ANS:
ANS:
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ANS:
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ANS:
D
B
A
B
C
D
B
A
A
D
D
D
A
B
B
B
C
D
A
D
B
D
A
C
C
B
B
B
B
A
1
ID: A
COMPLETION
36. ANS: network
PTS: 1
37. ANS: Protocols
REF: Page 214
PTS: 1
38. ANS: Subnetting
REF: Page 208
PTS: 1
39. ANS: Transport
REF: Page 236
PTS: 1
40. ANS: private
REF: Page 209
PTS: 1
41. ANS: OSI
REF: Page 233
PTS: 1
42. ANS: Physical
REF: Page 262
PTS: 1
REF: Page 274
43. ANS: deencapsulation
PTS: 1
44. ANS: frame
REF: Page 268
PTS: 1
45. ANS: Application
REF: Page 273
PTS: 1
REF: Page 265
MATCHING
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
C
E
H
J
G
A
I
B
F
D
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
1
1
1
1
1
1
1
1
1
1
REF:
REF:
REF:
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REF:
2
Page 236
Page 227
Page 226
Page 222
Page 234
Page 216
Page 222
Page 227
Page 226
Page 227
ID: A
SHORT ANSWER
56. ANS:
It is responsible for routing packets through the internetwork. It uses ARP to find MAC addresses from IP
addresses. It is responsible for delivering packets efficiently. It is responsible defining and verifying source
and destination IP addresses.
PTS: 1
REF: Page 213
57. ANS:
ARP stands for Address Resolution Protocol, and it functions in the Internetwork layer. ARP’s job is to find
the MAC address of a device given its IP address.
PTS: 1
REF: Page 216
58. ANS:
Tracert sends an ICMP to the IP address with a TTL value of 1. When the first router receives the packet it
decrements the TTL to 0, discards the packet, and sends a TTL-expired packet to the sending computer. When
the sending computer receives the TTL-expired packet, it notes the address of the first router. Then it sends a
second packet with a TTL of 2. This time the packet gets to the second router, is discarded, and the second
router sends a TTL-expired packet. When Tracert receives this response, it notes the address of the second
router. This continues until the packet reaches the intended IP address.
PTS: 1
REF: Page 218
59. ANS:
TCP sets a maximum number of bytes to transmit before it must receive an acknowledgment of receipt from
the receiving station. If it does not receive an acknowledgement within a certain period, it assumes an error
has occurred and begins to retransmit the data since the last acknowledgement was received.
PTS: 1
REF: Page 225
60. ANS:
When a client computer makes a request, TCP begins the session by sending the receiving computer, which is
typically a server, a SYN segment. If the server is not busy, then it sends back an ACK-SYN packet
acknowledging the creation of the session. Then the client computer sends back an ACK segment to finalize
the connection.
PTS: 1
REF: Page 224
61. ANS:
APIPA stands for Automatic Private IP Addressing. APIPA provides a computer with an IP address when the
computer cannot contact a DHCP server.
PTS: 1
REF: Page 227
62. ANS:
DNS allows computers to contact other computers using a familiar name instead of a hard-to-remember IP
address. DNS keeps records of which name corresponds to which IP address in a DNS cache so that a
frequently accessed address can be resolved quickly. DNS is an Application layer protocol.
PTS: 1
REF: Pages 227-228
3
ID: A
63. ANS:
An IP address is a 32-bit number divided into 4, 8-bit octets that are separated by periods, which is called
dotted decimal notation. The first octet denotes the class of the IP address. Each octet can have a value from
0 to 255. The address has two parts—one is the network ID and the other is the host ID. The network portion
of the address is determined by the subnet mask.
PTS: 1
REF: Pages 232-233
64. ANS:
For Class A, all addresses beginning with 10
For Class B, addresses from 172.16 to 172.31
For Class C, addresses from 192.168.0 to 192.168.255
PTS: 1
REF: Page 233
65. ANS:
TCP and UDP are both Transport layer protocols, but TCP is considered reliable and UDP is considered
unreliable. TCP is connection-oriented, which means that it forms a connection before it transmits data,
thereby ensuring that the recipient is ready and waiting. The sender also waits for acknowledgements after
sending data. This behavior makes it reliable. UDP is connectionless, so it sends data and doesn’t wait to see
whether anyone is listening; no acknowledgements are involved in the communication.
PTS: 1
REF: Pages 222-225
66. ANS:
In a layered approach, each layer is only responsible for a specific task instead of the end-to-end
communication. Therefore, when a problem occurs, it is easier to pinpoint the layer that is affected and then
troubleshoot only that issue. In addition, by using a layered approach, upgrades in technology can be to
individual layers without affecting the others.
PTS: 1
REF: Page 264
67. ANS:
Application—Application
Presentation—Application
Session—Application
Transport—Transport
Network—Internetwork
Data Link—Network Access
Physical—Network Access
PTS: 1
REF: Pages 265-266
68. ANS:
The PDU for the Application, Presentation, and Session layers is data. The PDU at the Transport layer is a
segment, at the Network layer is a packet, and at the Data Link layer is a frame. The final PDU is in the form
of bits at the Physical layer.
PTS: 1
REF: Page 275
69. ANS:
It is the project name that was given to the standard that defines all physical elements of networking
communications. It represents the year and the month that the project began—February of 1980.
PTS: 1
REF: Page 275
4
ID: A
70. ANS:
The window 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.
PTS: 1
REF: Page 271
71. ANS:
When the window size is reached and no acknowledgement is received, then the transmitting device assumes
there is a problem and begins to retransmit. If this happens, the window size is reduced, thus causing the
transmitting device to send a smaller amount of data and relieving the load on the receiving device.
PTS: 1
REF: Page 271
72. ANS:
First, it checks the destination MAC address to make sure that it is intended for itself. Then it calculates the
CRC and compares it to the incoming frame’s CRC to make sure that the values are the same. Next, it strips
off the header and trailer information. Then the resulting packet is sent up to the Network layer.
PTS: 1
REF: Page 274
73. ANS:
Encoding is a process performed by the Physical layer that takes the frame from the Data Link layer and
changes it into 1s and 0s to be transmitted onto the medium. The type of signal that it is changed into is
dependent on the type of media.
PTS: 1
REF: Page 274
74. ANS:
Peer 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.
PTS: 1
REF: Pages 266-267
75. ANS:
The first layer is the Logical Link Control sublayer, and it is responsible for handling some kinds of error
recovery and flow control. The second layer is the Media Access Control sublayer, and it is responsible for
providing the MAC address. It also controls the way in which a device will access the network.
PTS: 1
REF: Page 278
5
Networking Test 4 Study Guide [Answer Strip]
ID: A
B
_____
9.
D 16.
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D 23.
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C 10.
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D 17.
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A 24.
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C 30.
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F
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1.
T
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B 31.
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A 18.
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D 25.
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D 11.
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T
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4.
B 32.
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B 19.
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T
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5.
B 12.
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B 26.
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B 33.
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B 20.
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D
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D 27.
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B 34.
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B 21.
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A 14.
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A 28.
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A 35.
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C 22.
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A
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8.
D 15.
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C 29.
_____
Networking Test 4 Study Guide [Answer Strip]
E 47.
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H 48.
_____
J 49.
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G 50.
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A 51.
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I 52.
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B 53.
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F 54.
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D 55.
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C 46.
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ID: A