Section 2.3 Flashcards
What does MAC stand for?
Media Access Control
How many bytes long is a MAC address?
6 bytes
What is the first section of the MAC address called?
OUI: Organizationally Unique Identifier/Manufacturer’s ID
What is the second section of the MAC address called?
NICS: Network Interface Controller-Specific/Serial number
What is Full Duplex
Data can be sent and received at the same time
Switch vs Hub, which does half vs full duplex
Switches do full, hubs do half
What happens when there’s a transmission collision on a hubbed network?
The network hears the collision, waits a random amount of time and tries again
Command to list all MAC and associated IP addresses
arp -a
What does ARP stand for?
Address Resolution Protocol
What does ARP do?
Similar to DNS and NAT, it translates between IP and MAC addresses
What does VLAN stand for?
Virtual Local Area Network
What’s the purpose of VLAN?
to divide up a single switch for multiple LANs
What is a VLAN trunk?
A VLAN trunk allows you to connect the VLANs of one switch to another’s using a single connection
How does data on a VLAN trunk know where to go?
Data that enters a VLAN trunk is tagged so it knows where to go at its destination
What prevent data from looping endlessly in Layer 3?
Time To Live/TTL
What prevents data from looping endlessly in Layer 2?
Rapid Spanning Tree Protocol/RSTP
How do you test to see if jumbo frames can be transmitted?
Ping with a jumbo frame size
What’s the MTU of a Jumbo Frame?
9,000 Bytes
What’s the MTU of a standard frame?
1,500 Bytes
How is Voice VLAN configured?
Most switches automatically configure VoIP devices when they’re detected
What is a Voice VLAN?
A dedicated VLAN for VoIP traffic
LACP
Link Aggregation Control Protocol
What’s the difference between Port Aggregation and LACP?
Port Aggregation is static and requires manual configuration
LACP is dynamic and is configured automatically
How does Port Aggregation/LACP work?
It’s the combining of multiple ports between switches to increase bandwidth and redundancy
What is Neighbor Discovery Protocol?
ARP for IPv6 networks
What is 802.1Q?
Port Tagging for VLANs
What utility does Port Mirroring have?
Traffic analysis
What’s the difference between PoE and PoE+?
PoE+ provides more power
