Chapter 8 Flashcards
Implementing Ethernet Virtual LANS
- Which of the following port states are stable states used when STP has completed convergence? (Choose two answers.)
a) Blocking
b) Forwarding
c) Listening
d) Learning
e) Discarding
a) Blocking
b) Forwarding
Which of the following bridge IDs wins election as root, assuming that the switches with these bridge IDs are in the same network?
a) 32769:0200.1111.1111
b) 32769:0200.2222.2222
c) 4097:0200.1111.1111
d) 4097:0200.2222.2222
e)40961:0200.1111.1111
c) 4097:0200.1111.1111
Which of the following are transitory port states used only during the process of STP convergence? (Choose two answers.)
a) Blocking
b) Forwarding
c) Listening
d) Learning
e) Discarding
c) Listening
d) Learning
Which of the following facts determines how often a nonroot bridge or switch sends an STP Hello BPDU message?
a) The Hello timer as configured on that switch.
b) The Hello timer as configured on the root switch.
c) It is always every 2 seconds.
d) The switch reacts to BPDUs received from the root switch by sending another BPDU 2 seconds after receiving the root BPDU.
b) The Hello timer as configured on the root switch.
Which of the following RSTP port states have the same name and purpose as a port state in traditional STP? (Choose two answers.)
a) Blocking
b) Forwarding
c) Listening
d) Learning
e) Discarding
b) Forwarding
d) Learning
RSTP adds features beyond STP that enable ports to be used for a role if another port on the same switch fails. Which of the following statements correctly describe a port role that is waiting to take over for another port role? (Choose two answers.)
a) An alternate port waits to become a root port.
b) A backup port waits to become a root port.
c) An alternate port waits to become a designated port.
d) A backup port waits to become a designated port.
a) An alternate port waits to become a root port.
d) A backup port waits to become a designated port.
What STP/RSTP feature causes an interface to be placed in the forwarding state as soon as the interface is physically active?
a) STP
b) EtherChannel
c) Root Guard
d) PortFast
d) PortFast
Which optional STP feature reacts to a subset of incoming STP BPDUs to disable the port, but allows and processes some other STP BPDUs?
a) Loop Guard
b) BPDU Guard
c) Root Guard
d) PortFast
c) Root Guard
The most critical piece of information (for this discussion) in this tag is the VLAN ID.
802.1Q
What is 802.1Q?
A networking standard that defines a method for VLAN tagging in Ethernet frames
It allows multiple VLANs to exist on a single physical link.
What is an access interface?
A port on a switch configured to connect end devices to a single VLAN
Access interfaces typically do not carry traffic from multiple VLANs.
What is a data VLAN?
A VLAN used specifically for user data traffic
Data VLANs separate user data from other types of traffic such as management or voice.
What is the default VLAN?
The VLAN that is used by default for untagged traffic on a switch
On many switches, the default VLAN is VLAN 1.
What is a Layer 3 switch?
A switch that can perform routing functions in addition to switching
Layer 3 switches operate at the network layer and can route traffic between different VLANs.
What is a native VLAN?
The VLAN that is assigned to carry untagged frames on a trunk link
By default, the native VLAN is often set to VLAN 1, but it can be changed.
What is a static access interface?
An access port that is manually configured to belong to a specific VLAN
Unlike dynamic interfaces, static access interfaces do not change VLAN membership automatically.
What is a trunk?
A trunk is a communication line or link designed to carry multiple signals simultaneously, typically used in networking to connect switches.
What is a trunk interface?
A trunk interface is a network interface that is configured to carry traffic for multiple VLANs simultaneously.
What is trunking administrative mode?
Trunking administrative mode refers to the configuration setting that determines whether a port is set to operate as a trunk port or an access port.
What is trunking operational mode?
Trunking operational mode describes the current functioning state of a port, indicating whether it is actively passing trunked traffic.
What does VLAN stand for?
VLAN stands for Virtual Local Area Network.
What is a voice VLAN?
A voice VLAN is a dedicated VLAN specifically configured to prioritize voice traffic, ensuring quality of service for voice communications.
What does VTP stand for?
VTP stands for VLAN Trunking Protocol.
What is VTP transparent mode?
VTP transparent mode is a configuration mode in which a switch does not participate in VTP advertisements and can create, modify, or delete VLANs locally without affecting other switches.
What command creates a VLAN and puts the CLI into VLAN configuration mode?
vlan vlan-id
This command is essential for setting up a VLAN on a switch.
What subcommand is used to name a VLAN?
name vlan-name
Naming VLANs helps in identifying them easily in the network.
What is the effect of the [no] shutdown command in VLAN configuration?
[no] shutdown enables a VLAN, while shutdown disables it
This command controls the operational status of the VLAN.
What global config command has the same effect as the [no] shutdown VLAN mode subcommands?
[no] shutdown vlan vlan-id
This command is used for enabling a specific VLAN.
What command defines the VTP mode?
vtp mode {server | client | transparent | off}
VTP (VLAN Trunking Protocol) modes control how VLAN information is propagated.
What command configures the trunking administrative mode on an interface?
switchport mode {access | dynamic {auto | desirable} | trunk}
This command is critical for managing how traffic is handled on the switch ports.
What subcommand statically configures an interface into a VLAN?
switchport access vlan vlan-id
This command assigns a specific VLAN to an access port.
What command defines the type of trunking to use on an interface?
switchport trunk encapsulation {dot1q | isl | negotiate}
This command specifies the encapsulation method for VLAN tagging.
What command defines the native VLAN for a trunk port?
switchport trunk native vlan vlan-id
The native VLAN is used for untagged traffic on a trunk link.
What command disables the negotiation of VLAN trunking?
switchport nonegotiate
This command is used to prevent automatic negotiation of trunking settings.
What command defines the voice VLAN on a port?
switchport voice vlan vlan-id
This command allows for the configuration of voice traffic handling on a switch port.
What command defines the list of allowed VLANs on a trunk port?
switchport trunk allowed vlan vlan-list
This command overrides the existing list of allowed VLANs on the trunk.
What does the command ‘switchport trunk allowed vlan {add | remove} vlan-list’ do?
It adds to or removes from the current set of allowed VLANs on a trunk.
What is the function of the command ‘switchport trunk allowed vlan {all | none | except vlan-list}’?
It defines the allowed VLAN list as either all VLANs, no VLANs, or all except those in the configured list.
What happens to the existing list of allowed VLANs when using ‘switchport trunk allowed vlan {all | none | except vlan-list}’?
It ignores the existing list of allowed VLANs.
What does the command ‘show interfaces status’ list for access ports?
The access VLAN
This command provides details about the operational status of interfaces.
What does the command ‘show interfaces status’ list for trunk ports?
The word trunk
This indicates that the port is configured as a trunk.
What information does ‘show interfaces interface-id switchport’ provide?
Administrative settings and operational state of an interface
This command helps in understanding the configured parameters of the interface.
What does the command ‘show interfaces trunk’ display?
Information about all operational trunks
This includes the VLANs that can be forwarded over the trunk.
What is the purpose of the command ‘show interfaces interface-id trunk’?
Lists trunking status about the listed interface
This applies regardless of whether the interface currently operates as a trunk.
What does ‘show vlan [brief]’ command show?
Each VLAN and all interfaces assigned to that VLAN
This command does not include operational trunks.
What information can be obtained from ‘show vlan {id vlan-id | name vlan-name}’?
Information about a specific VLAN by ID or name, including trunks
This provides detailed insights into a particular VLAN.
What does the command ‘show vtp status’ list?
VTP configuration and status information
This command is useful for understanding the VTP domain and its configuration.
What does VLAN stand for?
Virtual Local Area Network
True or False: VLANs can improve network security by segmenting traffic.
True
Fill in the blank: The standard for VLAN tagging in Ethernet frames is ______.
802.1Q
Which of the following is NOT a reason for using VLANs? A) Improved security B) Reduced broadcast domains C) Increased network latency D) Simplified network management
C) Increased network latency
What is the purpose of VLAN trunking?
To allow multiple VLANs to traverse a single network link.
