Networking Flashcards
Physical components layer 1
Physical layer, wires, computers, switches
What is encoding and what layer is it on?
Encoding is a pattern of voltage or currant used to represent bits; the 1 and 0.
Layer 1 physical layer
What is the signal method? What layer is it on?
The method of representing the bits. IE The physical layer standards of what represents a 1 or 0
What is bandwidth?
Bandwidth is the capacity of a medium to carry data. The amount of data can flow from one place to another in a amount of time BPS
What is throughput and what factors influence it?
The measure of the transfer of bits across the media over a given period of time. The amount of traffic, the type of traffic, the latency.
What is the difference between a strait through cable vs a cross over cable?
Strait through cables connect two unlike devices where crossover cables connect two like devices.
What does the data link layer do?
The data link layer prepares network data for the physical network.
What is point to point topology? Hub topology? And full mesh topology?
Point to point is a permanent link between two endpoints. Hub a Centre point that connects to all endpoints. Mesh every end point connects to every other end point.
What is the difference between half and full duplex?
Half duplex can send and receive but not at the same time. Full duplex can send and receive at the same time.
What is a MAC address?
A burnt in address on each device made of 48 but hex-decimal format.
What is a IP address?
Your computers address. Can and is changed frequently. 32 bits in dotted decimal.
What is a switch? What does it do?
A layer 2 device for connecting end users. Operates in a single network.
Uses MAC address.
What is a router and what does it do?
A layer three device. Finds where a target is located and sends info to that destination. Connects networks.
Uses IP addresses.
What is LAN?
Local area network.
For short distances.
Exclusively Ethernet.
Switches
What is wan?
Wide area network.
Uses routers.
What is IANA?
Internet assigned numbers authority.
Your IP address.
What is the IEEE?
Institute of electrical and electronic engineers.
Your MAC address.
What is ANSI?
Something to do with Telecom.
What are the 7 layers of the OSI model?
Open system interconnection:
7: application (data)
6: presentation (data)
5: session (data)
4: transport (segment)
3: network (packet) (IP)
2: data link (frame) (Mac)
1: physical (bit)
What is the point of the layer model?
Reduce complexity
Isolate problems
What is bit encoding?
Converting bits to voltage levels.
What is attenuation?
How much the signal strength diminishes over distance.
What is the meaning of bandwidth and the network meaning of bandwidth?
The difference between high and low frequency.
Rate of bits sent.
Who loves you?
Brooke does! ; 3
What is a strait through cable?
Connect unlike devices.
What is a crossover cable?
Connect like devices.
What does forwarding frames do?
Organizes information.
Uses MAC address
What is connection based access?
All pc’s compete for media.
Each pc connected to a bus
What is control based access?
Only 1 pc can transmit at a time.
Avoids all collision.
What is CSMA/CA?
All hosts connected to a shared medium.
All users listen for collision.
If collision happens every one pulls out
Random timer.
What is CSMA/CA?
(Currently used) All hosts connect to a shared medium. Host listens until medium is free. Send a signal to claim medium for a amount of time. Sender starts sending frames.
