Chapter 2: Fundamentals Of Ethernet LANs Flashcards
Which device types transmit on pins 1 and 2?
PCs / Routers / WAP
Which device types transmit on pins 3 and 6?
Hubs / Switches
What cable type is required to connect 2 switches?
Crossover cable
What cable type is required to connect a router to a switch?
Straight through cable
What is multi-mode fibre?
Fibre which allows light to enter the core from multiple angles
What is single-mode fibre?
Fibre which sends light from a specific angle
Which has a longer maximum distance, multi or single mode?
Single-mode
What is 1000BASE-LX also known as? What is it made from, and what is it’s maximum speed and distance?
802.3z / Fibre / 5000m / 1000Mbps
What is 802.3an also known as? What is it made from, and what is it’s maximum speed and distance?
10GBASE-T / Copper / 100m / 10Gbps
Provide the formal informal and formal IEEE names for the copper cable to provide speeds of 1000Mbps over 100m distance
1000BASE-T / 802.3ab
How many bytes make up the OUI in a MAC?
3
What is FFFF.FFFF.FFFF? What does it do?
Broadcast address. Sends frames to all devices on the LAN
What fields create an Ethernet header?
Preamble
Start Frame Delimiter (SFD)
Destination MAC
Source MAC
Type
Data
What is FCS? What does it do and how large is it?
Frame check sequence. Determines if any transmission errors occurred. 4 bytes
What is preamble? How large is it?
Identifies the start of a frame. 7 bytes.
How many bytes is a MAC?
6 bytes
What field is in an Ethernet trailer?
Frame sequence check (FCS)
What is CSMA/CD? What does it do?
Carrier Sense Multiple Access with Collision Detection / Assists with collision detection in half duplex environments
Name 2 standards for multi-mode, and list their max distances
10GBASE-S (400m) / 10GBASE-LX4 (300m)
What mode are 10GBASE-LR and 10GBASE-E? What is their maximum distance?
Single-mode. 10km / 30km respectively
What fibre cable type would you recommend for a user on a low budget to connect 2 devices 300m apart?
Multi-mode
