Ethernet basics Flashcards
What is the purpose of using small discrete frames instead of sending data all at once over a network?
Big data chunks would monopolize the network and reduce availability for other people.
What is a frame’s preamble.
An eight byte “warning of incoming data” segment in a frame for NICs
True or false: The “Type” section within a frame tells the NIC if the data within is an email, http, etc.
False. It only tells if the data is IPv4, 6, etc.
When is padding used in a frame and why?
Padding is used when a frame does not meet minimum size requirements of 64bytes.
What is baseband
One signal over a wire at a time
What is broadband
Multiple signals over the same wire. Ex: Your tv and internet signal over the same coax cable is your ‘broadband connection’
On an 8P8C connector what are the sending and receiving pins
1 and 2 send
3 and 6 receive
What does TIA 568 A start with
GW, G
What does TIA 568B start with
OW, O
On a 10BaseT network how many hosts can a hub handle? And What topology i scommonly used?
1024, starbus
What does the “Carrier sense” of CSMA/CD mean?
The ability for NICS to detect when a signal is already on the network’s wire and wait to transmit their data when it’s free.
What does the “Multiple access” part of CSMA/CD mean?
All computers have equal access to the network wire
What does the “Collision detection” part of CSMA/CD mean?
When a collision is detected (NICS can do that apparently), the two sending NICS will stop transmitting and wait for a random interval before checking the wire again.
How are switches better than hubs
They create a point to point connection between nodes, giving them maximum bandwidth.
What happens when you first turn on a switch?
It will act like a hub until it has gathered all the MAC addresses of the nodes on its network.
What is the purpose of an uplink port?
To connect another switch
How can you connect two switches without an uplink port?
A crossover cable. Though this is only useful on old 10BASET networks.
Which legacy networks would require crossover cables for their switches?
10 and 100 BASE-T
What is the purpose of STP
Spanning tree protocol prevents bridging loops by disabling ports that could lead to bridging loops happening.
Why do some network technicians purposely make a bridging loop?
For redundancy. STP will block the connection until it’s needed.
Spanning tree protocol uses a _____ switch as a point of reference to map the network
Root
What is the correct orientation to read the numbers on an rj-45?
Clip facing the floor, gold contacts at the top, 1-8 left to right.
What is Ipv6 ND?
neighbor discovery is how Ipv6 resolves IPV6 addresses to MAC addresses. It can also do this to find the default gateway. It is a replacement for IPv4’s ARP.
IPv6 will broadcast a neighbour discovery and request the information of a local PC, at which point the destination computer will respond.
What is the term for a pc that can use both ipv6 and ipv4
Dual stack
