Week 10 Flashcards
(20 cards)
What does OSI stand for?
Open Systems Interconnection (Model).
When was the OSI model developed?
In the late 1970s.
What is a common size for transport layer packets?
512 bytes.
A bridge can be used to connect network segments. They only pass data on to relevant stations. However, many networks now use switches instead because switches contain memory and software, making data flow faster.
Just a statement 😁
This is the best explanation of a hub ever!
A hub is at the centre of a bike wheel. Spokes are connected to the hub and connect them to the outside of the ring.
In a network, a hub sits in the centre, and it connects elements of the network.
Which really explains much better why hubs just spit out the data to every connected node! Brilliant.
What is a simplex data stream?
Data that only goes in one direction, like TV broadcast.
What is a half duplex data stream?
Data that can flow in both directions, but not at the same time.
What is a full duplex data stream?
Data can be sent and received in both directions at the same time.
Can the presence of noise corrupt bits?
Yes. It’s just like when you’re talking to someone in a noisy environment - you lose bits and pieces of what they’re saying to you. They did say a complete sentence, but you only received some of it.
What happens when the data rate is increased?
The bits become shorter - which also means that more bits are affected by a given pattern of noise. It’s the same as when someone is talking to you very fast. Higher data flow but also higher chance of you not picking up/understanding every word they say. At a given noise level, the higher the data rate, the higher the error rate.
What is the transmission rate of a Cat5 UTP cable?
100mbps at max distance of 100m.
What is the transmission rate of a Cat5e UTP cable?
1gbps at max distance of 100m.
What is the transmission rate of a Cat6 UTP cable?
1gbps at distance of 100m and 10gbps at 500m distance.
What is the transmission rate of a Cat6a UTP cable?
10gbps at max distance of 100m.
What kind of cable should all new installations use?
At least a Cat6 cable.
What does gbps stand for?
Gigabits per second.
What is the standard wifi protocol?
802.11.
What does WAP stand for?!
A wireless access point. So like a router.
What is bandwidth?
The range of frequencies constituting a band, within which particular signal can be transmitted over a medium without distortion. It’s the measure of the width of a frequency - not transmission speed!
