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Q3
Which two of the routing protocols below use 'hop count' to calculate their distance
metric? (Select two)A. IGRPB. OSPFC. EIGRPD. RIP v.2E. RIP v.1
Ans: D; E
Explanation: RIP use the hop count to measure the distance to a destination.
Reference:
Incorrect Anss
A, C: IGRP and EIGRP use a composite metric that is calculated by factoring weighted
mathematical values for internetwork delay, bandwidth, reliability, and load
B: OSPF supports one or more metrics. It does not use hop counts however.
Q4
What are the advantages of using OSPF over RIPv1 when one's configuring together a
large network? (Select two)A. Has faster convergence.B. Requires less router memory.C. Has fewer internal tables to manage.D. Has low bandwidth consumption using incremental updates.
Ans: A, D
Explanation:
A: OSPF has a faster convergence time than RIP.
D: OSPF use incremental updates, while RIP broadcasts the entire routing table.
Incorrect Anss
B: OSPF is more processor intensive. With faster processors this is not a big issue.
C: OSPF use a more complex algorithm. These algorithms require more internal tables.
Q5
The Bellman-Ford algorithm is used by the grand majority of distance vector routing
protocols in calculating routes. One sophisticated distance vector protocol doesn't use this
algorithm; instead it uses DUAL (diffusing update algorithm). Which of the following
routing protocols is it?A. IGRPB. OSPFC. EIGRPD. RIP v.2E. RIP v.1
Ans: C
Explanation: The Enhanced Interior Gateway Routing Protocol (EIGRP) use DUAL for route
calculation.
Q6
Drag each characteristic to the appropriate routing protocol type.
Ans:
Q7
With regards to RIP v.1 networks, which of the following two statements are true? (Choose
two)A. RIP v.1 route updates have a subnet mask field.B. RIP v.1 networks are known as classful networks.C. RIP v.1 networks are known as classless networks.D. RIP v.1 route updates do not have a subnet mask field.
Ans: B, D
Explanation:
There are two versions of RIP, namely RIPv1 and RIPv2. RIPv1 is only capable of classful
routing. The routing updates do not carry subnet information, which means that a network's size
is determined solely by the network class of its IP Address, and there is no way to split a network
into smaller subnets, each routed along a different path.
RIP cannot handle Classless routing. RIP v1 summarizes all routes it knows on classful
network boundaries, so it is impossible to subnet a network properly via VLSM if you are
running RIP v1, which is a Classful routing protocol.
Q8
Which of the following types of authentication does RIPv2 support?A. MD5 onlyB. PAP and CHAPC. clear text and PAPD. clear text and MD5
Ans: D
Explanation:
PAP and CHAP are used by PPP on serial WAN links for authentication.
RIP uses clear text and MD5.
Verifying MD5 Authentication
By configuring the RA and RB routers as shown above, all routing update exchanges will be
authenticated before being accepted. This can be verified by observing the output obtained from
the debug ip rip and show ip route commands.
RB#debug ip rip
RIP protocol debugging is on
*Mar 3 20:48:37.046: RIP: received packet with MD5 authentication
*Mar 3 20:48:37.046: RIP: received v2 update from 141.108.0.10 on Serial0
*Mar 3 20:48:37.050: 70.0.0.0/8 via 0.0.0.0 in 1 hops
Authentication
Authentication can prevent communication with any RIP routers that are not intended to be part
of the network, such as UNIX stations running routed. Only RIP updates with the authentication
password are accepted. RFC 1723 defines simple plain-text authentication for RIPv2.
MD5 Authentication
In addition to plain-text passwords, the Cisco implementation provides the ability to use
Message Digest 5 (MD5) authentication, which is defined in RFC 1321. Its algorithm takes as
input a message of arbitrary length and produces as output a 128-bit fingerprint or message
digest of the input, making it much more secure than plain-text passwords.
Subsection: Miscellaneous Addressing (4 questions)
Q
Which of the following routing protocols uses the Class D address of
224.0.0.9 to multicast its routing updates?A. EIGRPB. OSPFC. IGRPD. RIPv2
Ans: D
Explanation:
Class D addresses are not as widely used. Class D addresses are multicast
addresses; some Class D multicast addresses used by routing protocols are as
follows:
o OSPF - 224.0.0.5 and 224.0.0.6
o Routing Information Protocol version 2 (RIPSv2) - 224.0.0.9
o EIGRP - 224.0.0.10
Reference: Building Scalable Cisco Networks (Ciscopress) page 69
Q2
You have the binary IP address, {11000000.10100100.11000000.00000001 }.
What class of IP address is it, and what is a characteristics of that class?A. It is a Class B public address.B. It is a Class C public address.C. It is a Class B private addressD. It is a Class C private address.E. It is a Class D experimental address.
Ans: B
Explanation:
11000000.10100100.11000000.00000001 = 192.164.192.1 = A public Class C
address
Reference: Building Scalable Cisco Networks (Ciscopress) page 66
Q3
You are the network administrator at CertKing . CertKing is assigned a
network of 200.10.5.0/24. You want to create 5 subnets from the assigned
address.
Which subnet mask will give you 5 subnets and the most possible hosts per
subnet?A. /21B. /23C. /26D. /27E. /29
Ans: D
Explanation: We need 5 subnets from the given address 200.10.5.0/24. It means
we will do 3 bits of subnetting which will provide us 8 subnets as 2N = 23 =8
subnets where n=number of subnet bits. So, we will have a total of 24+3 = 27
network bits.
Q4
You are the network engineer at CertKing . CertKing has a branch office
with five devices that require public IP addresses.
Which of the following subnet masks will provides the most efficient
allocation of addresses?A. 255.255.255.128B. 255.255.255.248C. 255.255.255.252D. 255.255.255.254
Ans: B
Explanation:
Requirement = 5 public IP addresses to connect 5 devices
3-bits of hosts means 23= 8 addresses
It means Network Bits will be 32 - 3 = 29 so we will use the subnet mask /29
11111111.11111111.11111111.11111000
255 . 255 . 255 . 248
Section 6: Describe concepts relating to extending IP addresses and
the use of VLSMs to extend IP addresses (7 questions)
Q
When an administrator uses VLSM to subnet a network address, which of the following
rules must be adhered to? (Select three)A. A subnet is made up of all aggregated routes.B. A subnet can address hosts, or be further subnetted.C. A routing protocol must carry the subnet mask in updates.D. Summarized networks must have the same high-order bits.
Ans: B, C, D
Explanation: All these statements are true regarding VLSM subnetting.
B: A subnet can address hosts, or be further subnetted.
C: The subnet mask must be include in route updates.
D: Summarized routes must have the same network number, ie. the same high order bits.
Incorrect Anss
A: Route aggregation is not subnetting, it is supernetting.
Q2
Which two of the statements below correctly describe features of Variable Length Subnet
Masking (VLSM)? (Select two)A. It supports IP version 4 and 6.B. It accommodates overlapping address ranges.C. It allows for better route summarization within routing tables.D. It allows subnetworks to be further divided into smaller subnets.
Ans: C, D
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