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Explanation:
C: VLSM allows multiple levels of subnetworked IP addresses within a single network, and thus
allow for better route summarization within routing tables.
D: VLSMs provide the ability to include more than one subnet mask within a network, and the
ability to subnet an already subnetted network address.
Incorrect Anss
A: VLSM was constructed for IP version 4.
B: Overlapping address ranges should not be used with VLSM.
Q3
The CTO of CertKing INC. has called a meeting with all the system administrators to
update them on managements latest expansion plan of establishing multiple remote offices,
and connecting those remote offices to the central office by a WAN. Management is
insistent on having a state of the art addressing scheme with VLSM, and they need six
useable host addresses at each remote location. Which Variable length subnet mask would
you suggest to the CTO?A. /24B. /28C. /29D. /30E. /31
Ans: C
Explanation: To provide for six usable host addresses three host bits must be used. This would
give exactly six host address (2^3-2=6). This would leave 29 (32-3) bits for the network mask.
Q4
You're boss has assigned you the difficult task of subnetting a Class B network, so you
choose 172.29.100.0/28. Which of the following Ans choices reflect a valid VLSM subnet
that can be obtained from your Class B network?A. 172.29.100.8B. 172.29.100.32C. 172.29.100.60D. 172.29.100.104
Ans: A
Explanation: We have the network 172.29.100.0/28 which is a subnetted Class B network. We
want to identify a valid VLSM subnet mask of this network, which subnets this network further.
We recalculate the subnetted network in binary to better study it. We must make sure that only
the host bits, and not the network bits, are used in the fourth octet.
First octet Second
octet Third Octet Fourth Octet Comments
172 29 100 0
10101100 00011101 01100100 00000000 This is the network address
172 29 100 8
10101100 00011101 01100100 00000100 This is a valid subnet of the
172.29.100.0/28
network.
172 29 100 32
10101100 00011101 01100100 00100000 This is a supernet of
172.29.100.0/28.
172 29 100 60
10101100 00011101 01100100 00111100 This is a supernet of
172.29.100.0/28.
172 29 100 104
10101100 00011101 01100100 01101000 This is a supernet of
172.29.100.0/28.
Q5
You have an address space of 172.28.100.0/24. You want to use this address space for your
WAN links by dividing the address space using a VLSM mask of 30 as follows:
172.28.100.0/30
How many subnets will this provide for WAN links?A. 14B. 30C. 62D. 126E. 254
Ans: C
Explanation:
172 28 100 0
10101100 00011110 01100100 00000000 This is the entire address
space
172 28 100 0
10101100 00011110 01100100 00000000 This is the 30-bit VLSM
mask
We can use 6 bits in the fourth octet for subnets. This gives us 2^6-2=62 subnets
Q6
You are a young entrepreneur with the ambition of starting your own network for a
proposed adult venture. One of the local ISP's gives you a good deal on bandwidth, and
assigns you the address space of 192.168.100.0/24 for your WAN links. If you use the
VLSM mask of /30 to divide this network, how many subnets will you get?A. 14B. 30C. 62D. 126E. 254
Ans: C
Explanation:
First octet Second octet Third Octet Fourth Octet Comments
192 168 100 0
10000000 10101000 01100100 00000000 This is the entire address
space
192 168 100 0
11000000 10101000 01100100 00000000 This is the 30-bit VLSM
mask
We can use 6 bits in the fourth octet for subnets. This gives us 2^6-2=62 subnets
Reference: Building Scalable Cisco Networks (Ciscopress) page 73
Q7
You've secured the subnet and mask of 186.37.100.0/26 to use for some of your companies
remote offices. Which VLSM mask below could provide you with six useable host
addresses in each branch subnet?A. /24B. /28C. /29D. /30E. /31
Ans: C
Explanation: 3 bits (32-29) for the host would provide for 2^3-2=6 hosts as is required.
Section 7: Describe the features and operation of EIGRP (17 Questions)
Q 1
Which of the following statements correctly describe features and characteristics of EIGRP
routing? (Select three)A. It sends periodic updates every 60 seconds.B. EIGRP uses DUAL to achieve rapid convergence.C. Adjacencies exist between master routers (MRs) in each domain.D. It uses multicast to discover other EIGRP routers on an internetwork.E. EIGRP provides support for multiple network layer protocols: IPX, AppleTalk, and IP.
Ans: B, D, E
Explanation:
B: Enhanced IGRP uses the Diffusing Updatebased algorithm (DUAL).
D: EIGRP use hello multicast packets for neighbor discovery/recovery
E: EIGRP supports IPX, Appletalk, IP, etc.
Reference: Introduction to Enhanced IGRP (EIGRP)
http://www.cisco.com/warp/public/459/7.html
Incorrect Anss
A: EIGRP use triggered updates, not periodic updates.
C: Each EIGRP router maintains a neighbor table that lists adjacent routers. However, there is
no concept of master routers in EIGRP.
Q2
Which EIGRP table is similar to OSPF's Link State Adjacency table?A. Neighbor tableB. Routing tableC. Topology tableD. Successor table
Ans: A
Explanation:
Neighbor table - Each EIGRP router maintains a neighbor table that lists adjacent routers. This
table is comparable to the neighborship (adjacency) database used by OSPF.
Reference: Building Scalable Cisco Networks (Ciscopress) page 250
Q3
Drag the correct EIGRP term on the left to the slot in the middle that is adjacent to the
correct description on the right.
Neighbor table - lists adjacent routers
Topology Table - route entries for all destinations.
Routing table - best routes to a destination
Successor - primary route used to reach a destination
Feasible successor - backup route to the destination.
Explanation:
o Neighbor table - Each EIGRP router maintains a neighbor table that lists adjacent routers.
This table is comparable to the neighborship (adjacency) database used by OSPF.
o Topology Table - An EIGRP router maintains a topology table for each network protocol
configured: IP, IPX, and AppleTalk. All learned routes to a destination are maintained in the
topology table.
o Routing table - EIGRP choose the best routes to a destination from the topology table and
places these routes in the routing table. The router maintains one routing table for each
network protocol.
o Successor - This is the primary route used to reach a destination. Successors are kept in the
routing table.
o Feasible successor - This is a neighbour that is downstream with respect to the destination, but
it is not the least-cost path and thus is not used for forwarding data. In other words, this is a
backup route to the destination. These routes are selected at the same time as successors, but
are kept in the topology table.
Reference: Building Scalable Cisco Networks (Ciscopress) page 250
Q4
Which three of the following terms are known as 'reliable packets' in EIGRP? (Select
three)A. helloB. ACKC. replyD. queryE. update
Ans: C, D, E
Explanation: In EIGRP, the reliable packets are reply, query and update.
Q5
Which one of the following statements best describes the way EIGRP advertises subnet
mask information to its destination networks?A. EIGRP advertises a prefix length for each destination network.B. EIGRP advertises a fixed length subnet mask for each destination network.C. EIGRP advertises only a classful subnet mask for each destination network.D. EIGRP, like IGRP and RIP, does not advertise a subnet mask for each destination
network.
Ans: A
Explanation:
EIGRP advertises a prefix length to each destination network. It supports VLSM which allows
subnet masks to be automatically summarized at the network boundary, and EIGRP can also be
configured to summarize on any bit boundary at any interface.
B is incorrect because EIGRP supports Variable Length subnet masks. C is incorrect because
EIGRP supports classless interdomain routing. D is incorrect because EIGRP is more
sophisticated then IGRP and RIP and actually does advertise a subnet mask to each destination
network.
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