8/13/2019 CCNA3 Chap 6 Study Answers

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CCNA3 Exploration Chapter 6 [Study questions]

6.1

How are VANs and su!nets related"

Each VLAN is associated with a different subnet, so each VLAN has its owngroup of IP addresses.

How do hosts on one VAN #o$$uni#ate with hosts on another VAN"

The packets have to be routed from one VLAN subnet! to another b" using arouter or a mu#ti#a"er switch!.

%n traditional inter&VAN routin'( how is the swit#h lin)ed to the router"

There is a separate #ink, switch port and router port for each VLAN. Theswitch ports connected to the router are in access mode, not trunk mode.

*hat is +router on a sti#), inter&VAN routin'"

There is one trunked #ink connecting the router to the switch, so that a## theVLANs use the same ph"sica# router port.

Can all routers $a)e a trun)ed lin) to a swit#h"

Not a##. It depends on the router I$%.

Ea#h VAN is a separate su!net( so ea#h VAN will need a di--erent %address on the router. How #an all the VANs share one inter-a#e"

%evera# sub interfaces, one for each VLAN, are configured on one ph"sica#interface, and each sub interface is given a different IP address.

Suppose that a C is on VAN /. *hat de-ault 'ateway should !e#on-i'ured on the C"

The address of the router interface connected to that VLAN, if traditiona# inter&VLAN routing is used, or the address of the router sub interface assigned tothat VLAN if router on a stick is used.

*hat is the VAN nu$!er i- a router su! inter-a#e is #on-i'ured as-ollows"R1(config)#int -00./R1(config-subif)#en#apsulation dot1q /0R1(config-subif)#ip address 12/.12./.1 /././.0R1(config-subif)#end

The VLAN number is '(

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8/13/2019 CCNA3 Chap 6 Study Answers

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4o you need to use the no shutdown #o$$and when #on-i'urin' arouter su! inter-a#e"

No. The no shutdowncommand goes on the ph"sica# interface, not on the

sub interface.

*hat are the ad5anta'es and disad5anta'es o- usin' +router on a sti#),rather than traditional inter&VAN routin'"

)sing a sing#e trunk #ink a##ows more VLANs to be added without the need fore*tra ph"sica# interfaces. It is cheaper to use a sing#e trunk #ink, becauserouters with man" interfaces are e*pensive. The ph"sica# cab#ing is simp#er.%ubinterfaces share the interface bandwidth and this might create abott#eneck. Not a## routers are ab#e to have subinterfaces configured forVLANs. The configuration for a trunk #ink is a bit more comp#icated than

configuring separate interfaces.

6./.1

4o you need to #on-i'ure a routin' proto#ol on a router that is used -orinter&VAN routin'"

No. If a## the VLANs are direct#" connected then it wi## not need a routingprotoco# to route between them. +irect#" connected networks go into therouting tab#e automatica##". A routing protoco# wi## on#" be needed if more than

one router is invo#ved.

*hen inter&VAN routin' is used( how are the swit#hports that lin) tothe router #on-i'ured"

If traditiona# inter&VLAN routing is used, with a separate #ink for each VLAN,then the switch port is in access mode and assigned to the appropriate VLAN.If router on a stick- is used, then the switch port is configured for trunking.

*hi#h show #o$$and produ#es this type o- output"

%how interface fa(/ switchport

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