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CompTIA Network+ N10-007 Certification Guide
Chapter 2 The OSI Reference Model
1) Which of the following is not a layer of the Open Systems Interconnect (OSI) reference
model?
A) Physical layer
B) Data link layer
C) Internet access layer
D) Presentation layer
2) What layer of the OSI corresponds to label A and B?
A) A is the host-to-host layer, and B is the Internet access layer.
B) A is the session layer, and B is the application layer.
C) A is the session layer, and B is the data link layer.
D) A is the session layer, and B is the physical layer.
3) At upper layers of the OSI reference model, bits are grouped together into protocol data units
(PDUs) or data service units.
4) The term packet is used fairly generically to refer to protocol data unit (PDU). There are PDU
equivalent names in the different OSI layers. What is the name of the unit in the physical layer of
the OSI reference model?
A) Segment
B) Frames
C) Bits
D) Packet
6) Which of the following is not a characteristic of the Media Access Control (MAC) sublayer of
the data link layer (Layer 2) of the OSI reference layered model?
A) The MAC sublayer uses a physical address call a MAC address, which is a 48-bit (6-byte)
address assigned to a device network interface card.
B) Layer 2 devices view a network as a logical topology.
C) Method of transmitting on the media.
D) The use of flow control on a network to prevent a receiver from being overwhelmed.
7) Which of the following layers of the OSI reference model is primarily concerned with
forwarding data based on logical addresses?
A) Physical layer
B) Data link layer
C) Network layer
D) Presentation layer
8) Switching is associated with Layer 2 (data link layer) and Layer 3 (network layer).
9) Which of the following transport layer protocol of the OSI reference model is a connection-
oriented protocol that provides reliable transport between two communicating hosts?
A) Transmission Control Protocol (TCP)
B) Transport Control Protocol (TCP)
C) User datagram Protocol (UDP)
D) Internetwork Packet Exchange (IPX)
10) Which OSI reference model layer is responsible for the following?
(a) Setting up session
(b) Maintaining a session
(c) Tearing down a session
A) Presentation layer (Layer 6)
B) Data link layer (Layer 2)
C) Session layer (Layer 5)
D) Transport layer (layer 4)
11) John, the network administrator of XYZ Corporation, is interested in changing the format of
text from American Standard Code for Information Interchange (ASCII) to Extended Binary
Code Decimal Interchange Code (EBCDIC). In addition, his IT manager requested that all
sensitive and confidential information on their servers should be protected by applying the
appropriate encryption. What OSI reference model layer is responsible for data format such as
encryption?
A) Presentation layer (Layer 6)
B) Data-link layer (Layer 2)
C) Session layer (Layer 5)
D) Transport layer (Layer 4)
12) Which of the following layers is not part of the TCP/IP protocol stack?
A) Transport
B) Application
C) Presentation
D) Internet
13) What is segment format A and B?
A) A is UDP segment format, and B is a TCP segment format.
B) A is TCP segment format, and B is a UDP segment format.
C) A is IPX segment format, and B is a SPX segment format.
D) A is SPX segment format, and B is a IPX segment format.
14) Which of the following protocol to TCP port matching is correct?
Protocol
TCP Port
FTP
80
SSH
22
Telnet
25
SMTP
23
DNS
53
HTTP
20 and 21
A) FTP 20 and 21, SSH 22, Telnet 23, SMTP 25, DNS 53, HTTP 80
B) FTP 20 and 21, SSH 23, Telnet 25, SMTP 25, DNS 80, HTTP 53
C) FTP 20 and 21, SSH 22, Telnet 25, SMTP 23, DNS 53, HTTP 80
D) FTP 20 and 23, SSH 22, Telnet 25, SMTP 25, DNS 53, HTTP 80
15) Which of the following protocol to TCP port matching is correct?
Protocol
TCP port
1
IMAP4
A
389
2
LDAP
B
3389
3
HTTPS
C
143
4
RDP
D
443
A) 1A, 2B, 3C, 4D
B) 1C, 2A, 3D, 4B
C) 1A, 2C, 3D, 4B
D) 1B, 2A, 3C, 4D
16) Which wiring standard is used on modern Ethernet connectors and jacks?
A) TIA/EIA-568-B
B) TIA/EIA-568-A
C) IEEE 802.3
D) IEEE 802.2
17) Broadband bandwidth usage divides the bandwidth into channels for use with multiple
communications streams.
18) Which type of transmission synchronization technique uses start and stop bits at the
beginning and end of a data frame?
A) Synchronous
B) Isochronous
C) Asynchronous
D) Biochronous
19) What is the name of the mechanism used by TCP to increase and decrease the number of
segments that are sent between each other before an acknowledgment is required?
A) Buffering
B) Synchronizing
C) Scaling
D) Windowing
