Refer to the exhibit. The switches have been configured with static VLANs as shown. During
testing, the network administrator notices that VLAN 20 on SwitchA has no connectivity with VLAN
30 on SwitchB. What should the network administrator do?
A.
Connect the two switches with a straight-through cable.
B.
Configure the interconnected ports on SwitchA and SwitchB into access mode.
C.
Ensure that the VTP passwords match on both switches.
D.
Configure the management VLAN with IP addresses.
E.
Add a Layer 3 device to connect VLAN 20 and VLAN 30.
Explanation:
Network devices in different VLANs cannot communicate with one another without a router to
route traffic between the VLANs. In most network environments, VLANs are associated with
individual networks or subnetworks.
For example, in an IP network, each subnetwork is mapped to an individual VLAN. Configuring
VLANs helps control the size of the broadcast domain and keeps local traffic local. However, when
an end station in one VLAN needs to communicate with an end station in another VLAN,
interVLAN communication is required. This communication is supported by interVLAN routing. You
configure one or more routers to route traffic to the appropriate destination VLAN.
The diagram below
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_5_2/layer3/routing.htm –
wp38860 shows a basic interVLAN routing topology. SwitchA is in VLAN 10 and SwitchB is in
VLAN20. The router has an interface in each VLAN.
Basic InterVLAN Routing Topology:
When HostA in VLAN10 needs to communicate with HostB in VLAN10, it sends a packet
addressed to that host. SwitchA forwards the packet directly to HostB, without sending it to the
router.When HostA sends a packet to HostC in VLAN20, SwitchA forwards the packet to the router,
which receives the traffic on the VLAN10 interface. The router checks the routing table,
determines the correct outgoing interface, and forwards the packet out the VLAN20 interface to
SwitchB. SwitchB receives the packet and forwards it to HostC.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_5_2/layer3/routing.htm#wp13354
