TestKing 642-813_formatted pdf格式

Exam A
QUESTION 1
TestKing uses layer 3 switches in the Core of their network. Which method of Layer 3 switching uses a
forwarding information base (FIB)?
A. Topology-based switching
B. Demand-based switching
C. Route caching
D. Flow-based switching
E. None of the other alternatives apply
Answer: A
Section: Implement VLAN based solution, given a network design and a set of requirements
Explanation/Reference:
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.
In other words, a route to 10.1.0.0/16 might be contained in the FIB, along with routes to 10.1.1.0/24 and
10.1.1.128/25, if those exist. Notice that these examples are increasingly more specific subnets. In the FIB,
these would be ordered with the most specific, or longest match, first, followed by less specific subnets.
When the switch receives a packet, it can easily examine the destination address and find the longest
match entry in the FIB. The FIB also contains the next-hop address for each entry. When a longest match
entry is found in the FIB, the Layer 3 next-hop address is found, too.
QUESTION 2
You need to design the VLAN scheme for the TestKing network. Which two statements are true about best
practices in VLAN design? (Select two)
A. Routing should occur at the access layer if voice VLANs are utilized. Otherwise, routing should occur at
the distribution layer.
B. Routing should always be performed at the distribution layer.
C. VLANs should be localized to a switch.
D. VLANs should be localized to a single switch unless voice VLANs are being utilized.
E. Routing should not be performed between VLANs located on separate switches.
Answer: BC
Section: Implement VLAN based solution, given a network design and a set of requirements