2_VLANS Flashcards
What is a broadcast domain?
A broadcast domain is the range within a network where a broadcast frame can be forwarded. VLANs are used to limit broadcast domains.
What is a VLAN, and why is it used?
VLAN (Virtual Local Area Network) is a logical partition of a layer 2 network into smaller broadcast domains. It improves network efficiency and security by isolating traffic.
What are the different types of VLANs?
1) Data VLAN (user VLAN)
2) Default VLAN (VLAN 1)
3) Black-hole VLAN (unused ports)
4) Management VLAN
5) Native VLAN
How do you assign a port to a VLAN in Cisco IOS?
1) Enter interface configuration mode: interface Fa0/1.
2) Assign the VLAN: switchport access vlan VLAN_ID.
3) Make it an access port: switchport mode access.
What is a VLAN trunk?
A VLAN trunk allows traffic for multiple VLANs to pass between switches. It enables devices in the same VLAN to communicate across different switches.
Why is VLAN tagging used, and which protocol is commonly used?
VLAN tagging adds identifiers to frames on trunk links to indicate their VLAN. IEEE 802.1Q is a common tagging protocol.
Name three basic commands to manage VLANs in Cisco IOS.
1) Create VLAN: vlan VLAN_ID.
2) Name VLAN: name VLAN_NAME.
3) Show VLANs: show vlan brief.
What is DTP, and why is it used?
DTP is a Cisco protocol used to negotiate and establish trunk links automatically between switches.
What are the three VTP modes?
1) Server: Creates, deletes, and propagates VLANs.
2) Client: Processes and forwards VLAN updates but cannot make changes.
3) Transparent: Does not share VLANs but forwards updates.
What are VLAN best practices?
4) Configure trunk ports manually and disable auto-negotiation.
