Ch5 InterVLAN Routing

Question 1

interVLAN Routing

Answer 1

process of forwarding network traffic between VLANs using a layer 3 network device or routed ports

Question 2

router-on-a-stick

Answer 2

router configuration where a single physical interface routes traffic between multple VLANs on a network; does not scale beyond 50 VLANs

Question 3

subinterfaces

Answer 3

software based virtual interfaces associated/linked to a single physical (master) interface

Question 4

Command Needed to Activate VLAN routing on 2960s

Answer 4

sdm prefer lanbase-routing

Question 5

Legacy InterVLAN Switch Config

Answer 5

vlan _first_vlan_id
interface _interface_id
switchport mode access
switchport access vlan _first_vlan_id
end
--repeat for additional VLANs--

Question 6

Legacy InterVLAN Routing

Answer 6

interface _interface_id
ip address _ip_address subnet_mask
no shutdown
–repeat for additional VLANs–

Question 7

Router on a Stick Router Setup

Configuring subinterfaces

Answer 7

interface _interface_id.subinterface_id (g0/.2)
encapsulation 1dotq _vlan_id
ip address _ip_address subnet_mask
–repeat for all subinterfaces needed–
interface interface_id_for“master” _interface
no shutdown - activates all subinterfaces

Question 8

Verifying Subinterfaces Setup on Router (2)

Answer 8

show vlan

show ip route

Question 9

Verify Switch Configuration

Answer 9

show interface _interface_id switchport

Question 10

Verify Router Configuration

Answer 10

show interfaces
show running-config
–both useful to check if encapsulation 1dotq is set correctly

Question 11

Where are Layer 3 Routed Ports Implemented

Answer 11

Between Distribution and Core Layer

Question 12

Spanning Tree

Answer 12

Protocol used to shut down redundant loops while maintaining flexibility and redundancy in inter-switch connections

Question 13

Reasons to Configure SVIs

Answer 13

1. Provide a gateway for a VLAN
2. Provide Layer 3 IP connectivity to a switch
3. Support routing protocol and bridging configurations

Question 14

Advantages of SVI

Answer 14

1. Faster than router on a stick or legacy
2. No need for external links from switch to router.
3. Not limited to one link; EtherChannels can be used between switches to increase bandwidth
4. Much lower latency

Question 15

encapsulation 1dotq _vlan_id

Answer 15

command used to ready subinterfaces for travel on 802.1q trunks

Question 16

routed port

Answer 16

Physical port that acts similarily to an interface on a router; not associated with a particularly VLAN and does not support subinterfaces

Question 17

no switchport

Answer 17

command used on routed ports to allow configuration of them for routing

Question 18

Configure Static Route on Catalyst 2960

Answer 18

sdm prefer lanbase-routing
ip routing (activates IP routing)
ip route 0.0.0.0 0.0.0.0 {next hop IP or exit-interface}

ip route _ip_address subnet_mask {next hop ip or exit interface

Question 19

Troubleshooting VLANs (3)

Answer 19

Must be defined across all switches.

Must be enabled on trunk ports.

Ports must be assigned to correct VLANs

Question 20

Troubleshooting SVIs (3)

Answer 20

Must have correct IP address and subnet.

SVIs must be up.

SVIs must match with VLAN number

Question 21

Troubleshooting Routing (2)

Answer 21

Routing must be enabled

Each interface or network should be added to routing protocol

Question 22

Troubleshooting Hosts (2)

Answer 22

Hosts must have correct IP and subnet

Hosts must have a default gateway associated with an SVI or routed port.