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Explanation: The bandwidth is a logical construct whose value can have wide-reaching implications on the
function of your network. It does not affect the actual speed of the link. In fact, it is practical to configure the
bandwidth command only on serial lines, where the speed of the link will vary considerably.
Router (config) # interface S0
Router (config-if) # bandwidth speed-of-line
EIGRP limits itself to 50 percent of the value specified in the bandwidth command, or if the bandwidth
command is
not set, the interface defaults. If you need to limit this percentage further, the upper limit that EIGRP uses can
be
stated as a percentage of the bandwidth command.
The ip bandwidth-percent-eigrp command interacts with the bandwidth command on the interface. You would
use this command primarily because in your network, the bandwidth command does not reflect the true speed of
the
link. The bandwidth command might have been altered to manipulate the routing metric and path selection of a
routing protocol, such as IGRP or OSPF. It might be better to use other methods of controlling the routing
metric
and return the bandwidth to a true value. Otherwise, the ip bandwidth-percent eigrp command is available. It is
possible to set a bandwidth percent that is larger than the stated bandwidth. This is with the understanding that,
although the bandwidth might be stated to be 56 kbps, the link is in fact 256 kbps. The following shows the
structure
of the ip bandwidth-percent eigrp command:
Router (config) #interface S0
Router (config-if) #ip bandwidth-percent eigrp autonomous-system-number percent

Q1
Based on the topology shown in the network diagram, what optional EIGRP configurations
will be required in order to achieve full connectivity within AS 100?A. Use the EIGRP no auto-summary command on CK1 and CK2 .B. Use the EIGRP no auto-summary command on CK3 and CK4 .C. Use the passive interface on the CK1 and CK2 interface that connects to the 10.1.1.0/24
and 10.1.2.0/24 subnet respectively.D. Use the passive interface command between the CK3 and T1 connection and between
the CK3 and CK2 connection.E. Use the variance command on CK3 .
Ans: A

Q2
You are the network engineer at CertKing . The CertKing network is shown in the following
graphic:
Router RTX is configured with the following commands:
interface serial 0
encap frame relay
You want to complete an EIGRP hybrid multipoint configuration on RTX S0.
Which command should you issue?A. bandwidth 56B. bandwidth 224C. bandwidth 256D. bandwidth 768
Ans: B

Explanation:
If the multipoint network has different speeds allocated to the VCs, take the lowest CIR and
simply multiply it by the number of circuits. This is applied to the physical interface. In the case
of the question 4*56=224 - bandwidth 224
Source: Self-Study CCNP BSCI Exam Certification Guide Third Edition P.490
Topic: Configuring Bandwidth over a Hybrid Multipoint Network
Section 2: Given an addressing scheme and other laboratory
parameters, identify the steps to configure a single-area OSPF
environment and verify proper operation (within described guidelines)
of your routers (3 questions)

Q 1
Exhibit:
Assuming that the 'router-id' command wasn't configured on the router CertKing 2; by
default what would CertKing 2's router ID be?A. 10.5.0.2B. 10.7.0.3C. 10.9.0.1D. 10.10.10.10
Ans: D

Explanation:
The highest ip address on an active interface is normally used as the OSPF router ID. This can be
overridden by configuring an IP address on a loopback address on a loopback interface.
Reference: Building Scalable Cisco Networks (Ciscopress) page 126

Q2
A German fast food chain started by a clown named Reinhardt von Dönhald, is planning
an aggressive global expansion. Their first goal is to establish a network connection for two
of its flagship restaurant franchises in Berlin and Nuremberg. Each franchise will have a
single LAN. You have been contracted to configure the first router at the Berlin franchise,
then take the autobahn to Nuremberg to configure that router on a latter date.
Since adjacent subnets are in use or are planned for the future growth on other routers in
the AS, be sure to utilize specific subnet information.
The Berlin router has so far been configured like this:
The router is named Berlin.
The clocking is provided on the Berlin router's serial 0/0 interface.
The secret password in the Berlin router is " CertKing ".
You should use OSPF in a single area
Area 0 should be used for the routing protocol.
Use 1 for the process ID of the routing protocol.
The IP addresses and subnet masks are listed in the chart.
Berlin
FA0/0 10.60.2.1/23
S0/0 10.60.4.1/30
Lo 0 10.90.20.10/32
Nuremberg
FA0/0 10.60.6.1/24
S0/0 10.60.4.2/30
Lo 0 10.90.20.20/32
Please provide the complete configuration and also the prompt where the configuration is
to be done.
Start by clicking on host that is connected to the router you want to configure.
Lab A
Berlin
FA0/0 10.60.2.1/23
S0/0 10.60.4.1/30
Lo 0 10.90.20.10/32
Secret Password: CertKing
Lab B
Nuremberg
FA0/0 10.60.6.1/24
S0/0 10.60.4.2/30
Lo 0 10.90.20.20/32
Ans:
<Click on Host2, which is connected to the Lab 1 router>
Berlin>enable <--- notice the prompt
Password: CertKing
Berlin# configure terminal
Berlin(config)#router ospf 1
Berlin(config-router)# network 10.60.2.1 0.0.1.255 area 0 <--- this specific mask should be use
to reflect the subnet mask of 23
Berlin(config-router)# network 10.60.4.1 0.0.0.3 area 0 <--- this specific mask should be use
to reflect the subnet mask of 30
Berlin(config-router)# network 10.90.20.10 0.0.0.0 area 0 <--- this > specific mask should be
use to reflect the
subnet mask of 32
Berlin(config-router)#exit
Berlin(config)#^Z
Berlin#copy running-config startup-config

Q3
Which command should you use to verify what networks are being routed by a given OSPF
process?A. show ip ospfB. show ip routeC. show ip protocolD. show ip ospf database
Ans: A
Cisco Press BSCI 3rd Edition Book, Page 252.
Subsection: OSPF with Frame Relay (13 questions)

Q 1
You are the chief system administrator of the CertKing headquarters. Your network consists of
a router named R1 that's configured in a hub and spoke topology, supporting 24 remote office
via a point-to-multipoint Frame Relay EIGRP network deployment. It has come to your
attention that your junior administrator has forgotton to configure the bandwidth command on
any of R1's serial interfaces or subinterfaces. What is the perceived bandwidth (as seen by the
EIGRP process) of each Frame Relay connection?A. 65 kbpsB. 128 kbpsC. 1.544 MbpsD. 1.536 Mbps
Ans: A

Explanation: EIGRP by default assumes the bandwidth is a T1 (1.544 Mbps) if not specified
(including subinterfaces). Because the question ask for "what is the bandwidth of each frame Relay
connection..." the Ans is 1.544 Mbps/24 = 64.3 kbps.

Q2
You are in the midst of configuring some point-to-point subinterfaces on your EIGRP Frame-
Relay network. Your junior administrator asks you if you now the default link speed on your
WAN interface. How would you reply?A. 256 KbpsB. 1.544 MbpsC. set by the PVCD. set by the DLCI
Ans: B

Explanation: The default EIGRP link speed is 1.544 Mbps for serial media.
Note: The enhanced code uses the "bandwidth" subcommand on interfaces and subinterfaces in order
to determine the rate at which to generate EIGRP packets. This parameter is automatically set on
fixed-bandwidth interfaces (such as LANs), but defaults to T1 (1544 Kbps) for all serial media.
Incorrect Anss
A: The default speed is 1.544 Mbps, not 256 Kbps.
C, D: The default speed is not set by the PVC or the DLCI.

Q3
Exhibit:
Assuming that router CertKing Z is configured with:
interface serial 0
encap frame relay
Which bandwidth command would complete the EIGRP hybrid multipoint configuration on the
S0 interface of router CertKing Z?A. bandwidth 56B. bandwidth 224C. bandwidth 256D. bandwidth 768
Ans: B

Explanation: Configuring Bandwith over a Hybrid Multipoint Network
If the multipoint network has differing speed allocated to the VCs, a more complete solution is needed. There
are two main approaches
1. To take the lowest CIR and to simply multiply this by the number of circuits. This is applied to the physical
interface. The problem with this configuration is that the higher bandwidth links will be under utilized for some
things.
Reference: CCNP Self-Study, CCNS, P BSCI Exam, Certification Guide
Clare Gough, Page 484

Q4
You are in the midst of configuring an NBMA network with EIGRP as the routing protocol.
Which of the options below would you use to configure the interface bandwidth for a point-topoint
interface?A. The DLCI assigns the bandwidth for the interface.B. The sliding window size determines interface bandwidth.C. You use the default bandwidth assigned to the interface.D. You manually configure bandwidth as the CIR of the PVC.
Ans: D