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- CCNP Switching 642-813
61.
You have configured voice VLANs on Catalyst switch R1. Which two statements are true about the
operation of voice VLANs on this device? (Select two)
- A.Trunk
- B.Isolated
- C.Primary
- D.Community
- E.Promiscuous
- F.None of the other alternatives apply
- Answer & Explanation
- Report
Answer : [E]
Explanation :
Explanation :
| Promiscuous: The switch port connects to a router, firewall, or other common gateway device. This port can communicate with anything else connected to the primary or any secondary VLAN. In other words, the port is in promiscuous mode, in which the rules of private VLANs are ignored. |
62.
Company has implemented numerous multilayer switches that utilize FIB tables. Which statement
is true about the Forward Information Base (FIB) table?
- A.The FIB is derived from the IP routing table and is optimized for maximum lookup throughput.
- B.The FIB table is derived from the Address Resolution Protocol table, and it contains Layer 2 rewrite (MAC) information for the next hop.
- C.When the FIB table is full, a wildcard entry redirects traffic to the Layer 3 engine.
- D.The FIB lookup is based on the Layer 2 destination MAC address.
- E.None of the other alternatives apply
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The Layer 3 engine (essentially a router) maintains routing information, whether from static routes or dynamic routing protocols. Basically, the routing table is reformatted into an ordered list with the most specific route first, for each IP destination subnet in the table. The new format is called a Forwarding Information Base (FIB) and contains routing or forwarding information that the network prefix can reference. |
63.
The Company network needs to pass traffic between VLANs. Which device should be used to
accomplish this?
- A.Hub
- B.Switch
- C.Router
- D.Bridge
- E.None of the other alternatives apply
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| A VLAN is a virtual LAN contained within a switch, so for it to pass information into a different VLAN within the same switch it has to leave that switch and re-enter via a router. VLANs contain local traffic only, so in order to reach users in another VLAN the traffic must go through a router or a layer 3 routing processor. |
64.
Inter-VLAN routing has been implemented in the Company network. In VLAN routing, what are
some of the disadvantages of designing a router-on-stick configuration? (Select three)
- A.InterVLAN routing cannot be filtered by the router.
- B.The router becomes a single point of failure for the network.
- C.Routers will not route STP BPDUs.
- D.There is a possibility of inadequate bandwidth for each VLAN
- E.Additional overhead on the router can occur.
- F.NetFlow Switching is required for InterVLAN accounting.
- Answer & Explanation
- Report
Answer : [B, D, E]
Explanation :
Explanation :
| A router connected to a switch via a single trunk link is better known as router-on-stick or even a one armed router. Since there's only one router, if that router were to go down there'd be no backup. Since there's only one router, that router would have to handle all the bandwidth of every VLAN so there's a chance it could be overloaded, as with the overhead problems of being responsible for too much. Because traffic routed between the VLANs traverse a single physical port, there is the potential to not provide for enough bandwidth for a VLAN at any given time. Inter-VLAN routing also does indeed require additional configuration, management, and overhead. |
65.
Which of the following could be used to provide a Layer 3 data path between separate VLANs?
(Choose two.)
- A.VLAN trunking
- B.An external router
- C.An internal route processor
- D.VLAN capable bridge
- E.EtherChannel
- Answer & Explanation
- Report
Answer : [B, C]
Explanation :
Explanation :
|
To transport packets between VLANs, you must use a Layer 3 device. Traditionally, this has been
a router's function. The router must have a physical or logical connection to each VLAN so that it
can forward packets between them. This is known as interVLAN routing. InterVLAN routing can be performed by an external router that connects to each of the VLANs on a switch. Separate physical connections can be used, or the router can access each of the VLANs through a single trunk link. |
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