IT 341 MIDTERM QUESTIONS & VERIFIED ANSWERS
Layer 1 of OSI - Answers - Physical Link:
- Cables used, types of connectors, how long they can be. - - Ethernet cable specifies
the electrical characteristics of the twisted pair cable.
- The size and shape of the connector's the maximum length of the cables.
Layer 2 of OSI - Answers - Data Link:
- Ethernet, token ring.
- This is where switches operate.
- MAC addressing.
- Meaning is assigned to the bits that are transmitted over the network.
- Size of each packet of data to be sent, means of addressing each packet so that its
delivered.
- Error detection/correction data sent = data received. two notes don't try to transmit
data on the network at the same time.
Layer 3 of OSI - Answers - Network Layer:
- Processes used to route data across the network. - Important protocol is IP (Logical
network) (paired with TCP).
- IP Address. RIP, routing protocols. What is after next HOP.
Layer 4 of OSI - Answers - Transport Layer:
- One network pc communicates with another network PC. - You'll find TCP.
- Move packets over the network reliably and without error. Acknowledging the receipt
of packets and resending packets that aren't received or are corrupted when they arrive.
- Divides large messages into smaller packets.
- Reassembles packages to make sure all are received and no data is lost.
- UDP (broadcast message to multiple networks). Used by DNS to look up domain
through a UDP packet.
Layer 5 of OSI - Answers - Session Layer:
- Establishes sessions between network nodes.
- Setting up and taking down between two communicating points.
- Session must be established before data can be transmitted over the network.
- Session Lyer makes sure that these sessions are properly established/maintained.
Layer 6 of OSI - Answers - Presentation Layer:
- Responsible for converting the data sent over the network from one type of
representation to another.
- Compress data so fewer bytes of data are required to represent the information when
it's sent over the network.
- Transport Layer on other end will decompress the data.
- Encryption using scramble.
, Layer 7 of OSI - Answers - Application Layer:
- Layer at which application programs interact with the network, using programming
interfaces to request network services. HTTP (basis for WWW).
TCIP/IP Model - Answers - - Application: Represents data to the user plus encoding and
dialog control.
- Transport: Supports communication between diverse devices across diverse networks.
- Internet: Determines the best path through the network.
- Network Access: Controls the hardware devices and media that make up the network.
- Single network to single network. UDP is for broadcasting message to multiple
networks.
What type of cable should be used to connect the different devices? - Answers - -
Rollover: PC to router console
- Straight-through: Twisted pair copper wire for LAN. RJ 45 connectors have the same
pin-out.
- Cross-over: Connects computing devices directly.
- Fiber/wireless (non-router)
Ping vs tracer route - Answers - - Ping determines whether or not specific ip address is
possible.
- Tracer route: Traces a packet from your computer to the host, but shows how many
hops it takes to reach host and how long each hop takes. TTL (time to live) is a number
which shows how many hops are allowed before it is returned to it's original sender (to
avoid loops).
Ranges of IP Addresses A B C - Answers - - Class A: 0.0.0.0 -
127.255.255.255/255.0.0.0
- Class B: 128.0.0.0 - 191.255.255.255/255.255.0.0
- Class C: 192.0.0.0 - 223.255.255.255/255.255.255.0
Configuring login passwords that are encrypted/unencrypted - Answers - Non-
encrypted:
- console password OR enable password
Encrypted:
- enable secret
- no enable password
- line console 0
- line vty 0 4
- enable secret
Layer 1 of OSI - Answers - Physical Link:
- Cables used, types of connectors, how long they can be. - - Ethernet cable specifies
the electrical characteristics of the twisted pair cable.
- The size and shape of the connector's the maximum length of the cables.
Layer 2 of OSI - Answers - Data Link:
- Ethernet, token ring.
- This is where switches operate.
- MAC addressing.
- Meaning is assigned to the bits that are transmitted over the network.
- Size of each packet of data to be sent, means of addressing each packet so that its
delivered.
- Error detection/correction data sent = data received. two notes don't try to transmit
data on the network at the same time.
Layer 3 of OSI - Answers - Network Layer:
- Processes used to route data across the network. - Important protocol is IP (Logical
network) (paired with TCP).
- IP Address. RIP, routing protocols. What is after next HOP.
Layer 4 of OSI - Answers - Transport Layer:
- One network pc communicates with another network PC. - You'll find TCP.
- Move packets over the network reliably and without error. Acknowledging the receipt
of packets and resending packets that aren't received or are corrupted when they arrive.
- Divides large messages into smaller packets.
- Reassembles packages to make sure all are received and no data is lost.
- UDP (broadcast message to multiple networks). Used by DNS to look up domain
through a UDP packet.
Layer 5 of OSI - Answers - Session Layer:
- Establishes sessions between network nodes.
- Setting up and taking down between two communicating points.
- Session must be established before data can be transmitted over the network.
- Session Lyer makes sure that these sessions are properly established/maintained.
Layer 6 of OSI - Answers - Presentation Layer:
- Responsible for converting the data sent over the network from one type of
representation to another.
- Compress data so fewer bytes of data are required to represent the information when
it's sent over the network.
- Transport Layer on other end will decompress the data.
- Encryption using scramble.
, Layer 7 of OSI - Answers - Application Layer:
- Layer at which application programs interact with the network, using programming
interfaces to request network services. HTTP (basis for WWW).
TCIP/IP Model - Answers - - Application: Represents data to the user plus encoding and
dialog control.
- Transport: Supports communication between diverse devices across diverse networks.
- Internet: Determines the best path through the network.
- Network Access: Controls the hardware devices and media that make up the network.
- Single network to single network. UDP is for broadcasting message to multiple
networks.
What type of cable should be used to connect the different devices? - Answers - -
Rollover: PC to router console
- Straight-through: Twisted pair copper wire for LAN. RJ 45 connectors have the same
pin-out.
- Cross-over: Connects computing devices directly.
- Fiber/wireless (non-router)
Ping vs tracer route - Answers - - Ping determines whether or not specific ip address is
possible.
- Tracer route: Traces a packet from your computer to the host, but shows how many
hops it takes to reach host and how long each hop takes. TTL (time to live) is a number
which shows how many hops are allowed before it is returned to it's original sender (to
avoid loops).
Ranges of IP Addresses A B C - Answers - - Class A: 0.0.0.0 -
127.255.255.255/255.0.0.0
- Class B: 128.0.0.0 - 191.255.255.255/255.255.0.0
- Class C: 192.0.0.0 - 223.255.255.255/255.255.255.0
Configuring login passwords that are encrypted/unencrypted - Answers - Non-
encrypted:
- console password OR enable password
Encrypted:
- enable secret
- no enable password
- line console 0
- line vty 0 4
- enable secret
