2A Flashcards
What does VLAN stand for?
Virtual Local Area Network
A ____ is defined as a “logical” grouping of network devices into a single broadcast domain or flat network.
VLAN
____ networks have a single broadcast domain, meaning that every connected device sees every broadcast packet that is transmitted.
Flat
Switches provide _____ Layer 3 services (Broadcast control) using VLANs to segment or create smaller broadcasts domains.
limited
A common example of a type of broadcast you might see on your network is a computer merely…?
sending out a hello packet
In small networks, this is not a problem. When you have thousands of
computers sending out a broadcast hello packet that all the connected computers see; however, we start to have bandwidth issues.
VLAN’s limit broadcasts by keeping the broadcast from one VLAN
from going to another VLAN. This segmentation means that communication between VLANs must go through a…?
Layer 3 routing process
What are the three VLAN benefits?
- Increased Security (Who has Access)
- Flexibility and Scalability
- No Geographical Barrier
What VLAN benefit is the following describing?
Every broadcast frame transmitted on a segment is seen by all devices on the segment, regardless of whether the device needs the data. Security is increased because only those devices part of the same
VLAN will receive the frame. The administrator controls each port and whatever resources it is allowed to use. VLANs keep local traffic local to a particular broadcast domain, which ensures that traffic from one VLAN is not accessible from another.
Increased Security (Who has Access)
What VLAN benefit is the following describing?
VLANs add flexibility to your network by limiting or adding only the device you want in the broadcast domain regardless of its physical location.
Flexibility and Scalability
What VLAN benefit is the following describing?
By using VLANs, you are no longer confined to creating workgroups based on physical locations. A VLAN can span multiple “physical” LAN segments but have the same Broadcast Domain (Logical).
No Geographical Barrier
VLANs can exist on a single switch or span multiple switches such as what two switches?
ASWs (Access Switches) and DSWs (Distribution Switches)
Cisco switches come with default ____ _ already created. After your additional VLANs are created, you will assign selected switch ports to each VLAN.
VLAN 1
We identify VLANs using a _______, notice VLAN 1, VLAN 10, VLAN 20, and so on. When you create a VLAN or use a VLAN, you will reference this _______ in all systems.
number
If you create VLAN 30 on one switch and create VLAN 30 on a connected switch, they will both treat all VLAN 30 traffic as a
_____ _____ _____.
single local network
VLANs should also be given a descriptive _____. “Sales” is a better name than the default name “VLAN0010”. Using JUNOS, a VLAN is created with a ____, and then assigned a number. The concept of a VLAN remains the same.
name
Initially, all switch ports are assigned to default VLAN 1 until…?
changed by the administrator
A ____ _________ indicates which VLAN or VLANs are assigned to a certain physical port for traffic forwarding and filtering.
VLAN membership
A port can only be a member of ____ VLAN.
one
On Cisco switches, this is done with the “____ ____” command while in privileged EXEC mode.
show vlan
What is VLAN trunking?
A trunk is a connection between network devices that can carry more than one VLAN.
Trunks are also referred to as?
Tagged ports
Access ports are also referred to as?
Untagged ports
What are two common trunking methods?
- Inter-Switch Link (ISL) – Cisco proprietary standard for trunks (deprecated)
- IEEE 802.1q – defined open standard for trunks
_________ is a way of encapsulating a VLAN frame that utilizes a space in the standard frame header.
IEEE 802.1q
____ also tags the frame but instead of using the frame as it is, ___ adds a new header and trailer to the existing frame.
ISL (Inter-Switch Link)
What does ISL stand for?
Inter-Switch Link
ISL only works with ______devices, where IEEE 802.1q works with _____
major manufacture’s models.
cisco
all
________ _____ is used for purposes such as telnet (logging on to a computer), Simple Network Management Protocol (SNMP) (manage and monitor network devices), and syslog (network devices sending messages to a logging server).
Management VLAN
VLAN 1 may unwisely span the entire network if not appropriately pruned. If its scope is large enough, the risk of compromise can increase significantly. You should not make…?
VLAN 1 the management VLAN
