L1 fundamental Flashcards
1
Q
Plenum cabling
A
Cable in between the structured ceiling and drop down ceiling
2
Q
Runts
A
Frames smaller than 64 bytes
3
Q
Giants
A
Frames larger than 1515 bytes
4
Q
CRC
A
Cyclical Redundancy Check
Frames where CRC/FCS was wrong
5
Q
Frame
A
Frame has an illegal format
6
Q
Collison
A
Frame collision occurred
7
Q
Late collison
A
Collison occurred after 512 bytes
8
Q
Input error
A
Bad frames received
9
Q
802.3AF
A
POE=15.4w
10
Q
802.3AT
A
POE+=30w
11
Q
802.3BT Type 3
A
4PPOE=60w
12
Q
802.3BT Type 4
A
100w
13
Q
SR (short range)
A
-Uses multimode fiber (MM)
-Can go up to 300m
-OM3 MM 70m and OM4 MM 100m
14
Q
LR (long range)
A
-single-mode fiber (SMF)
-Go up to 10 Km
15
Q
FC-FEC
A
25g =3m
