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NCTI 3 TO 4 GUIA
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Exam of 46 pages for the course NCTI 3 TO 4 GUIA at NCTI 3 TO 4 GUIA (NCTI 3 TO 4 GUIA)
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NCTI 3 TO 4 GUIAWhich TCP/IP Internetwork Layer provides troubleshooting utilities, such as
ping and traceroute Correct Ans - Internet Control Message Protocol
(ICMP)
Which is the primary purpose of the Open Systems Interconnection reference
model (OSI/RM) Presentation Layer Correct Ans - It defines the
format in which Application Layer information is sent across the network.
Which is the primary purpose of the Open Systems Interconnection reference
model (OSI/RM) Session Layer? Correct Ans - • It establishes,
manages, and terminates dialogs between Presentation Layer entities.
Which of the following is the primary purpose of the Open Systems
Interconnection Reference Model (OSI/RM) Transport Layer? Correct Ans
- It defines well known logical port addresses for communications between
applications.
The Open Systems Interconnection Reference Model (OSI/RM) Data Link
Layer serves which primary purpose Correct Ans - It builds a flat
network model with unroutable physical addresses
The Open Systems Interconnection Reference Model (OSI/RM) Application
Layer serves which primary purpose? Correct Ans - It provides the
user interface to the system
The Open Systems Interconnection Reference Model (OSI/RM) Network Layer
serves which primary purpose? Correct Ans - It uses Layer 3 (Network
Layer) addresses to create multiple routed networks.
The Open Systems Interconnection reference model (OSI/RM) Physical Layer
serves which primary purpose? Correct Ans - It transmits data in the
form of bits across the physical medium.
Which of the following best describes an email message's communication flow
through the TCP/IP model layers? Correct Ans - The Transport Layer
breaks the data stream into pieces, which it passes to the Internetwork Layer.
,The Internetwork Layer adds the source and destination Internet protocol
(IP) addresses and forwards the packets to the Network Interface Layer. The
Network Interface Layer builds frames, and converts them to bits for
transport across the physical network.
Which three of the following are functions of the TCP/IP Internetwork Layer?
(Choose three. Correct Ans - • A global addressing structure • Packet
fragmentation • Service type requests
Which three of the following are included in the TCP/IP Internetwork Layer?
(Choose three.) Correct Ans - • Internet Group Management Protocol
(IGMP).
• Internet protocol (IP).
• Address resolution protocol (ARP).
Which TCP/IP Internetwork Layer provides troubleshooting utilities, such as
ping and traceroute? Correct Ans - Internet Control Message Protocol
(ICMP).
Telnet is a protocol in which TCP/IP layer? Correct Ans - Application
The TCP/IP model Application Layer maps to which three Open Systems
Interconnection reference model (OSI/RM) layers? (Choose three.)
Correct Ans - *Application Layer.
• Session Layer.
• Presentation Layer.
The TCP/IP model Network Interface Layer maps to which Open Systems
Interconnection reference model (OSI/RM) layer(s)? (Choose all that apply.)
Correct Ans - • Physical Layer
• Data Link Layer
Transmission control protocol (TCP) includes which three types of
mechanisms to ensure reliable data transmission? (Choose three.) Correct
Ans - • Checksum
• Acknowledgements
• Sequence number
Which TCP/IP Transport Layer protocol provides an end-to-end, transaction-
,oriented, best-effort, connectionless service? Correct Ans - • User
datagram protocol (UDP).
Which TCP/IP Application Layer protocol allows companies to publicly post
information over the Internet? Correct Ans - • Network News Transfer
Protocol (NNTP)
A Class C network address provides for how many network and host bits?
Correct Ans - • 24 network, 8 hosts
Which are considered private Internet protocol (IP) addresses? (Choose
three.) Correct Ans - • 10.0.0.0
• 172.31.255.255
• 192.168.0.0
Which is a valid Class B network address? Correct Ans - •
151.129.89.76
Which is the valid Class C IP address range? Correct Ans - •
192.000.001.hhh-223.255.254.hhh
In which three ways do organizations benefit from using private IP
addresses? (Choose three.) Correct Ans - • They gain more network
design flexibility with a large address
range.
• They prevent Internet address clashes when obtaining only a small
range of Internet Corporation for Assigned Names and Numbers
(ICANN) assigned addresses.
• They conserve public IP addresses when uniqueness is not
required.
A Class D address is also known as which type of address? Correct Ans -
• Multicast
What does the class network number 127.x.y.z designate? Correct Ans -
• A loopback address
Which two of the following are considered reserved IP addresses? (Choose
two.) Correct Ans - • 0.x.y.z
, • 127.x.y.z
A Class C address provides for a maximum of how many usable hosts?
Correct Ans - • 254
Which is the valid Class B IP address range? Correct Ans - •
128.001.hhh.hhh-191.254.hhh.hhh
The Internet Assigned Numbers Authority (IANA) recommends organizations
use private IP addresses under which condition? Correct Ans - • The
network uses gateways, routers, or firewalls to act on the
network host's behalf.
Which two statements are true concerning IP addressing? (Choose two.)
Correct Ans - • The host portion should not be all 1s.
• The network portion bits should not be all 0s.
Which is the valid Class A IP address range available to network hosts?
Correct Ans - • 1.hhh.hhh.hhh-126.hhh.hhh.hhh
What must the Network Layer do to a received frame first in order to
determine the route over which it will forward the datagram to the next
network? Correct Ans - • Decapsulate the packet.
Which device provides the connection point between a workstation or
personal computer (PC) and the network? Correct Ans - • Network
interface card (NIC).
Hubs connect network hosts in which configuration? Correct Ans - •
Star
At what maximum distance would you have to add a repeater to a 10Base2
network segment to prevent signal degradation? Correct Ans - • 185 m
Which network device requires a device driver in order to connect hosts to
the network segment? Correct Ans - • Network interface card (NIC).
Which three of the following networking devices break up collisions? (Choose
three.) Correct Ans - • Bridge
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