INET NGN HESI RN EXIT EXAM 2019 ALL 160
QUESTIONS & ANSWERS INCLUDED - GUARANTEED
PASS A+
Computer Network - ANSWER: An interconnected group of autonomous computing
devies with varying levels of complexity.
Data Communication - ANSWER: The means by which these computing devices send
information to one another.
Nodes/Work Stations/ Clients - ANSWER: PCs, MACs, UNIX workstations, LINUX
workstations.
Servers/ Hosts - ANSWER: Processing computers, database servers, file and printer
server, communication servers, firewall computers with specialized operating
systems to securely share services across a network.
Interconnecting Devices - ANSWER: Devices connecting servers and clients.
(Switches, Routers, Hubs, Bridges, Etc.)
Protocols - ANSWER: Well-defined sets of rules which computers send/recieve
information on a computer network.
Topology - ANSWER: The physical and logical design of a computer network;
examples include mesh, bus, ring and star; the physical layout of the network devices
and the cabling, and how all the components communicate with each other.
Packet - ANSWER: A discrete data unit sent/recieved by networked devices.
Address - ANSWER: A unique identifier of a computing device on a computer
network.
LAN - ANSWER: Local Area Network: Interconnected computers which are
geographically close, usually within the same building or campus of buildings.
MAN - ANSWER: Metropolitan Area Network: Generally un-switched, ring-type
network that interconnects areas of a city.
WAN - ANSWER: Wide Area Network: The computers are far apart and usually
connected by long distance carriers, or radio waves. They connect 2 or more
geographically separated sites/locations.
WPAN - ANSWER: Wireless Personal Area Network: A wireless zone connecting
devices.
OSI Model General - ANSWER: 1. Allowed Multi-Vendor Systems
, 2. Standardized Communication.
3. Higher levels have more complex tasks, each layer does a task for the layer above.
4. Each layer communicates logically with its associated layer on the other computer.
5. Packets send in order 7-1, packets recieved come in order 1 - 7.
6. ISO specification for network architecture.
Layer 1 (Physical Hardware) - ANSWER: Bottom of the model. Deals with cables,
network interface cards, hubs. Specifies transmission media and deals with data
units in bits (1's, 0's, on/off).
Layer 2 (Data Link) - ANSWER: MAC Addresses, Switches, defines discrete message
units - Frames (PPP, IEEE802.x, FDDI).
Provides synchronization and flow.
Layer 3 (Network) - ANSWER: IP Address, Routers. Assembles the data link layer's
frame into datagrams. Analyzes addressing and forward packets to next logical
destination. Enables network to network transmission of data - routing. Provides the
functional and procedural means of transferring variable length data sequences from
one network to another. Performs QOS for the Transport Layer (Subnetwork access
and dependent/independent convergence).
Layer 4 (Transport) - ANSWER: TCP, UDP, Port Numbers. Error checking and
retransmission of corrupted or not recieved packets. Service addressing. Provides
transparent transfer of data between users (Reassembles the packet in the right
order and tunneling protocolrs like SNA over IP, IPX over IP).
Layer 5 (Session) - ANSWER: Establishes, manages, and terminates sessions between
two communicating hosts. Synchronizes dialog between the presentation layers of
the two hosts and manages their data exchange.
Layer 6 (Presentation) - ANSWER: Format data, does encryption and decryption.
Defines formats of data (ASCII, EBCDIC text, binary, JPEG, MPG, etc.).
Layer 7 (Application) - ANSWER: Top of the model. Allows access to network services
that support applications. Directly represents the services that directly support user
application. Handles network services access.
Layer 5: Application Layer (Internet Model) - ANSWER: Supports the application
commonly used across the WWW. FTP, DNS, Telnet, SNMP, SMTP, POP3, HTTP(s).
Also handles encryption and compression.
Layer 4: Transport Layer (Internet Model) - ANSWER: Maintains error-free, end-to-
end communication.
Uses TCP (Transmission Control Protocol) and UDP (User Datagram Protoocol). Error
Control - retransmission. Packet Sequencing and aging.
QUESTIONS & ANSWERS INCLUDED - GUARANTEED
PASS A+
Computer Network - ANSWER: An interconnected group of autonomous computing
devies with varying levels of complexity.
Data Communication - ANSWER: The means by which these computing devices send
information to one another.
Nodes/Work Stations/ Clients - ANSWER: PCs, MACs, UNIX workstations, LINUX
workstations.
Servers/ Hosts - ANSWER: Processing computers, database servers, file and printer
server, communication servers, firewall computers with specialized operating
systems to securely share services across a network.
Interconnecting Devices - ANSWER: Devices connecting servers and clients.
(Switches, Routers, Hubs, Bridges, Etc.)
Protocols - ANSWER: Well-defined sets of rules which computers send/recieve
information on a computer network.
Topology - ANSWER: The physical and logical design of a computer network;
examples include mesh, bus, ring and star; the physical layout of the network devices
and the cabling, and how all the components communicate with each other.
Packet - ANSWER: A discrete data unit sent/recieved by networked devices.
Address - ANSWER: A unique identifier of a computing device on a computer
network.
LAN - ANSWER: Local Area Network: Interconnected computers which are
geographically close, usually within the same building or campus of buildings.
MAN - ANSWER: Metropolitan Area Network: Generally un-switched, ring-type
network that interconnects areas of a city.
WAN - ANSWER: Wide Area Network: The computers are far apart and usually
connected by long distance carriers, or radio waves. They connect 2 or more
geographically separated sites/locations.
WPAN - ANSWER: Wireless Personal Area Network: A wireless zone connecting
devices.
OSI Model General - ANSWER: 1. Allowed Multi-Vendor Systems
, 2. Standardized Communication.
3. Higher levels have more complex tasks, each layer does a task for the layer above.
4. Each layer communicates logically with its associated layer on the other computer.
5. Packets send in order 7-1, packets recieved come in order 1 - 7.
6. ISO specification for network architecture.
Layer 1 (Physical Hardware) - ANSWER: Bottom of the model. Deals with cables,
network interface cards, hubs. Specifies transmission media and deals with data
units in bits (1's, 0's, on/off).
Layer 2 (Data Link) - ANSWER: MAC Addresses, Switches, defines discrete message
units - Frames (PPP, IEEE802.x, FDDI).
Provides synchronization and flow.
Layer 3 (Network) - ANSWER: IP Address, Routers. Assembles the data link layer's
frame into datagrams. Analyzes addressing and forward packets to next logical
destination. Enables network to network transmission of data - routing. Provides the
functional and procedural means of transferring variable length data sequences from
one network to another. Performs QOS for the Transport Layer (Subnetwork access
and dependent/independent convergence).
Layer 4 (Transport) - ANSWER: TCP, UDP, Port Numbers. Error checking and
retransmission of corrupted or not recieved packets. Service addressing. Provides
transparent transfer of data between users (Reassembles the packet in the right
order and tunneling protocolrs like SNA over IP, IPX over IP).
Layer 5 (Session) - ANSWER: Establishes, manages, and terminates sessions between
two communicating hosts. Synchronizes dialog between the presentation layers of
the two hosts and manages their data exchange.
Layer 6 (Presentation) - ANSWER: Format data, does encryption and decryption.
Defines formats of data (ASCII, EBCDIC text, binary, JPEG, MPG, etc.).
Layer 7 (Application) - ANSWER: Top of the model. Allows access to network services
that support applications. Directly represents the services that directly support user
application. Handles network services access.
Layer 5: Application Layer (Internet Model) - ANSWER: Supports the application
commonly used across the WWW. FTP, DNS, Telnet, SNMP, SMTP, POP3, HTTP(s).
Also handles encryption and compression.
Layer 4: Transport Layer (Internet Model) - ANSWER: Maintains error-free, end-to-
end communication.
Uses TCP (Transmission Control Protocol) and UDP (User Datagram Protoocol). Error
Control - retransmission. Packet Sequencing and aging.
