29 Questions
Which of the following statements regarding VLANs is true?
Computers on separate VLANs cannot communicate by default.
hat defines each VLAN?
Each VLAN is a unique broadcast domain.
How can communication be established between VLANs?
A router is needed to communicate among separate broadcast domains and unique IP subnetworks.
What is Inter-VLAN Routing?
Inter-VLAN Routing is the process of forwarding traffic from one VLAN to another VLAN using a router.
Question: Which of the following methods are commonly used for Inter-VLAN Routing? Select all that apply
(a) Router-on-a-stick Inter-VLAN Routing. (b) VLAN Trunking. (c) Traditional Inter-VLAN Routing. (d) Layer 2 Switching. (e) Switch Based Inter-VLAN Routing.
A, C, E
What characterizes Traditional Inter-VLAN Routing?
One router interface per VLAN
What characterizes Router-on-a-stick Inter-VLAN Routing?
One router interface for all VLANs
What is a requirement for Traditional Inter-VLAN Routing?
Routers must have multiple physical interfaces to facilitate inter-VLAN routing.
How are interfaces configured in Traditional Inter-VLAN Routing?
Each interface is configured with an IP address for the subnet associated with the particular VLAN it is connected to.
What capability does this configuration provide for network devices?
Network devices can use the router as a gateway to access devices within different VLANs.
Why does the physical approach of having one router interface per VLAN become hindered as the number of VLANs increases on a network?
It becomes limited by the physical hardware constraints of a router.
What limitation do routers face regarding the number of VLANs they can connect to?
Routers have a limited number of physical interfaces to connect to different VLAN
It is very expensive to add an Ethernet Interface.
True
What are the characteristics of Router-on-a-stick Inter-VLAN Routing in Configuring subinterfaces? Choose four
(a) Utilizes physical interfaces for each VLAN. (b) Relies on VLAN trunking for communication between VLANs. (c) Overcomes the hardware limitation of a router. (d) Subinterfaces are software-based virtual interfaces that are assigned to physical interfaces. (e) Each subinterface is configured with its own IP address, subnet mask, and unique VLAN assignment. (f) Connected to a switch trunk link. (g) Functionally the same as using the traditional routing model.
C, D, E, F
How does Router-on-a-stick Inter-VLAN Routing compare to the traditional routing model?
Functionally the same as using the traditional routing model.
What is the process for configuring subinterfaces in Router-on-a-stick Inter-VLAN Routing?
Create the subinterface, assign it to a VLAN, assign an IP Address, enable the interface.
What is the syntax for creating a subinterface in Router-on-a-stick Inter-VLAN Routing?
The syntax for the subinterface is always the physical interface, followed by a period and a subinterface number.
How is the subinterface number typically associated in Router-on-a-stick Inter-VLAN Routing?
The subinterface number is configurable, but it is typically associated to reflect the VLAN number.
What is the syntax used to configure a subinterface in Router-on-a-stick Inter-VLAN Routing?
R1(config)#interface [interface].nn
What additional configuration is required for the management VLAN in Router-on-a-stick Inter-VLAN Routing when using it on multiple switches not directly connected by trunk links?
The management VLAN must also be configured if you wish to use it on multiple switches that are not directly connected by trunk links.
What step is necessary before assigning an IP Address in Router-on-a-stick Inter-VLAN Routing?
Assign the interface to a VLAN using the proper encapsulation.
What command is used to configure the VLAN encapsulation for a subinterface in Router-on-a-stick Inter-VLAN Routing?
R1(config-subif)#encapsulation dot1q vlan-id
What role does the IP Address assigned to a subinterface serve in Router-on-a-stick Inter-VLAN Routing?
The IP Address serves as the default gateway for that VLAN.
Which command is used to assign an IP Address to a subinterface in Router-on-a-stick Inter-VLAN Routing?
R1(config-subif)#ip address [address] [mask]
How are subinterfaces enabled in Router-on-a-stick Inter-VLAN Routing?
Subinterfaces are automatically enabled when the physical interface is enabled.
What command is used to enable the physical interface in Router-on-a-stick Inter-VLAN Routing?
R1(config-if)#no shutdown
Subinterfaces are not enabled individually.
True
Which characteristics describe physical interfaces in Router-on-a-stick Inter-VLAN Routing? Choose five
(a) More expensive. (b) Connected to access mode switch port. (c) No bandwidth contention. (d) Less complex connection configuration. (e) One physical interface per VLAN. (f) Bandwidth contention. (g) One physical interface for many VLANs.
E, C, B, A, D
Which characteristics describe subinterfaces in Router-on-a-stick Inter-VLAN Routing? Choose five answers (a) One physical interface for many VLANs. (b) Bandwidth contention. (c) Connected to trunk mode switch port. (d) Less expensive. (e) More complex connection configuration. (f) One physical interface per VLAN. (g) No bandwidth contention.
A, B, C, D, E
Study Notes
VLANs and Inter-VLAN Routing
- A VLAN (Virtual Local Area Network) is defined by its VLAN ID, which is a number between 1 and 4094.
- Communication between VLANs can be established using Inter-VLAN Routing.
Inter-VLAN Routing Methods
- Commonly used methods for Inter-VLAN Routing include:
- Router-on-a-stick Inter-VLAN Routing
- Traditional Inter-VLAN Routing
- VLAN Trunking
- Switch Based Inter-VLAN Routing
Traditional Inter-VLAN Routing
- Characterized by having one router interface per VLAN
- Requires multiple physical interfaces on the router, each connected to a separate VLAN
- Physical interfaces are configured with an IP address, subnet mask, and VLAN assignment
- Limitation: routers face a limitation on the number of VLANs they can connect to due to the number of physical interfaces available
- Expensive to add Ethernet Interfaces
Router-on-a-stick Inter-VLAN Routing
- Characterized by using subinterfaces, which are software-based virtual interfaces assigned to physical interfaces
- Overcomes the hardware limitation of a router
- Relies on VLAN trunking for communication between VLANs
- Subinterfaces are configured with an IP address, subnet mask, and unique VLAN assignment
- Configuring subinterfaces provides a more scalable and cost-effective solution compared to Traditional Inter-VLAN Routing
- Syntax for creating a subinterface:
interface . - Subinterface number is typically associated with the VLAN ID
- Additional configuration is required for the management VLAN when using it on multiple switches not directly connected by trunk links
- Step necessary before assigning an IP Address: configuring the VLAN encapsulation for a subinterface using the
encapsulation dot1qcommand - IP Address assigned to a subinterface serves as the gateway for devices in the VLAN
- Command to assign an IP Address to a subinterface:
ip address - Subinterfaces are enabled by enabling the physical interface using the
no shutdowncommand
Subinterfaces vs Physical Interfaces
- Subinterfaces:
- One physical interface for many VLANs
- No bandwidth contention
- Less expensive
- More complex connection configuration
- Connected to trunk mode switch port
- Physical Interfaces:
- One physical interface per VLAN
- Bandwidth contention
- More expensive
- Less complex connection configuration
Test your knowledge of Virtual Local Area Networks (VLANs) and identify the correct statement about VLANs. Learn about VLANs and their applications in computer networks.
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