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Archive for the 'BSCI Questions' Category

Open Shortest Path First – OSPF Fundamentals – Questions and Answers – Question 4

Published
by
Deon Botha
on June 17, 2009
in BSCI, BSCI Questions, Certification, Cisco Systems and OSPF
. 2 Comments

Working from the my last couple of OSPF posts I am going to try and crystallize some of the material found by working through questions found in Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press book.

4. The address 192.100.56.10/21 has been allocated to an interface on the router. This interface alone is to be included in the OSPF process. State the command that would start the process on this interface.

To include this interface alone into the OSPF process

Router_2(config-network)#network 192.168.56.10 0.0.0.0 area number

According to the book (I don’t understand)

Router_2(config-network)#network 192.168.56.8 0.0.0.7 area number

I would have done it like below if I was going to include the entire range, because you are using the /21 which has 2048 nodes/hosts per network ( I hate it when I start doubting myself?!?!)

Router_2(config-network)#network 192.168.56.0 0.0.7.255 area number

Which coincidentally is also in the book (I’m totally confused but moving swiftly along).

The last method is allowing the /24 mask??? why I don’t know (in the book).

Router_2(config-network)#network 192.168.56.0 0.0.0.255 area number

I suppose all of the answers including the first one allows the address which was the goal. Not that allowing the /24 mask or the weird small portion of hosts make sense to me. (why? and where the logic comes from is making me scratch my head).

Resources:

Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Notes and Notices: This is a part of my personal BSCI notes and research to assist myself in learning and understanding the concepts and theory for the BSCI exam. I learn by making notes reading and writing things down and wish to file them where I cannot lose them. These notes are not to be seen, judged or mistaken for replacements to Cisco recognized and authorized training which I personally support and attend and suggest you undertake if you are going for the BSCI Certification.

Open Shortest Path First – OSPF Fundamentals – Questions and Answers – Question 3

Published
by
Deon Botha
on June 17, 2009
in BSCI, BSCI Questions, Certification, Cisco Systems, Concepts and Constructs and OSPF
. 0 Comments

Working from the my last couple of OSPF posts I am going to try and crystallize some of the material found by working through questions found in Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press book.

3. Is it possible to have more than one OSPF process on a router. How would you do this?

Yes it is possible to have more than one OSPF process on a router.

You may want to do this to create two different OSPF domains / areas with separate routing policies.

To accomplish this simply specify two (or more) OSPF processes in the following way:

Router_2(config)#router ospf 1
Router_2(config-router)#network [ip address] [mask] area [number]
Router_2(config-router)#exit
Router_2(config)#router ospf 2
Router_2(config-router)#network [ip address] [mask] area [number]

Resources:

Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Notes and Notices: This is a part of my personal BSCI notes and research to assist myself in learning and understanding the concepts and theory for the BSCI exam. I learn by making notes reading and writing things down and wish to file them where I cannot lose them. These notes are not to be seen, judged or mistaken for replacements to Cisco recognized and authorized training which I personally support and attend and suggest you undertake if you are going for the BSCI Certification.

Open Shortest Path First – OSPF Fundamentals – Questions and Answers – Question 2

Published
by
Deon Botha
on June 16, 2009
in BSCI, BSCI Questions, Certification, Cisco Systems, Concepts and Constructs, Cost and OSPF
. 0 Comments

Working from the my last couple of OSPF posts I am going to try and crystallize some of the material found by working through questions found in Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press book.

2. What Parameter is used to calculate the metric of a link in OSPF on a Cisco Router?

The OSPF metric used to calculate link speed is 100,000,000 divided by the bandwidth of the interface in bits per second.

Resources:

Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Notes and Notices: This is a part of my personal BSCI notes and research to assist myself in learning and understanding the concepts and theory for the BSCI exam. I learn by making notes reading and writing things down and wish to file them where I cannot lose them. These notes are not to be seen, judged or mistaken for replacements to Cisco recognized and authorized training which I personally support and attend and suggest you undertake if you are going for the BSCI Certification.

Open Shortest Path First – OSPF Fundamentals – Questions and Answers – Question 1

Published
by
Deon Botha
on June 15, 2009
in BSCI, BSCI Questions, Certification, Cisco Systems, Concepts and Constructs, OSPF and Priority
. 0 Comments

Working from the my last couple of OSPF posts I am going to try and crystallize some of the material found by working through questions found in Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press book.

1. What command is used to manually determine which router on a Local Area Network (LAN) will become the Designated Router (DR)?

The hello message includes a priority field which provides a mechanism to elect a Designated router (DR) and Backup Designated Router (BDR). To be eligible for election the value must be a positive integer between 1 and 255. A priority of 0 (zero) means the router cannot participate in the election process.

The highest priority wins the election process. All Cisco routers have a default priority of 1 (one), the highest Router ID is used as the tiebreaker when no manual adjustment is made.

The command to adjust priority on an interface-by-interface method is:

Router_2(config-if)#ip ospf priority number

In summation the designated router can be determined using the priority command.

Resources:

Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Notes and Notices: This is a part of my personal BSCI notes and research to assist myself in learning and understanding the concepts and theory for the BSCI exam. I learn by making notes reading and writing things down and wish to file them where I cannot lose them. These notes are not to be seen, judged or mistaken for replacements to Cisco recognized and authorized training which I personally support and attend and suggest you undertake if you are going for the BSCI Certification.

Enhanced Interior Gateway Routing Protocol – Scalable EIGRP – Scenario Two

Published
by
Deon Botha
on September 10, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

Working from the my last couple of EIGRP consists I am going to try and crystallize some of the material found by working through questions found in Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Hub and Spoke Over Subscribed

The 256 kbps access line to the hub has 56 kbps access lines to each of ten spoke sites. Each link has a Frame Relay Committed Information Rate (COR) of 56 kbps. The access line to each router reflects the CIR. The access line to the hub router, Router A, is 256 kbps, but the CIR of the hub is the same as its access line.

From a Frame relay perspective, a circuit is considered oversubscribed when the sub of the CIRs of the remote circuits is higher than the CIR of the hub location. With ten links, each with a CIR of 56 kbps, this circuit is oversubscribed (56 kbps * 10 = 560 kbps).

  1. How much bandwidth has each circuit been allocated? why was this value chosen by the administrator?
    The maximum allowed bandwidth is controlled by the hub (256 kbps) in this hub-and-spoke network, because the maximum total spoke bandwidth is more than the hubs CIR (560 kbps), one cannot allow any individual Permanent Virtual Circuit (PVC) to utilize more than (256 kpbs / 10) 25 kbps at one time.
  2. What bandwidth utilization is available to EIGRP? why was this value chosen by the administrator?
    Because not much user data traffic is expected and the data rate is low one can allow EIGRP to use as much as 90% of the bandwidth.
  3. If Router A fails, what would the effect be on the network?
    If Router A fails there would be no communication between spoke sites as Router A is the hub. Each individual site would function but WAN connectivity would be lost. Each spoke router will stop receiving Hellos for the Hold time duration (3x Hello) and then and assume that the neighbours are dead. There not being any neighbours to ask for a route,the Topology Table will be updated and the router will send updates out about this change.
  4. Is summarization possible on the routers entering the WAN cloud, or is it possible on the network not shown in the figure that are on the other side of the routers? Give a reason for your answer.
    EIGRP allows summarization at the interface level (barring that the addressing scheme is such that it will allow this to happen). This is an advantage of EIGRP over OSPF (OSPF allows summarization only at Area Border Router (ABR))

Resources:

Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Notes and Notices:

This is a part of my personal BSCI notes and research to assist myself in learning and understanding the concepts and theory for the BSCI exam. I learn by making notes reading and writing things down and wish to file them where I can’t lose them. These notes are not to be seen, judged or mistaken for replacements to Cisco recognized and authorized training which I personally support and attend and suggest you undertake if you are going for the BSCI Certification.

Enhanced Interior Gateway Routing Protocol – Scalable EIGRP – Scenario One

Published
by
Deon Botha
on September 10, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

Working from the my last couple of EIGRP posts I am going to try and crystallize some of the material found by working through questions found in Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press. The Scenario works from the EIGRP Technology White Paper Sections on Cisco.com

Frame-Relay Example

The above network is experiencing timeouts and network crashes. In addition, EIGRP appears to be losing routes from its routing tables, which is adding to the problem.

  1. What changes to addressing or EIGRP could affect the route drops and network problems? State the configuration commands necessary to activate this solution on Router A.
    Summarization is the keystone to scalable EIGRP operation. Summarization will limit the query range preventing query scoping. This will also prevent the routes in the Topology Table from being SIA, which affects performance.
    Enter Router Mode to Define Routing Protocol
    RouterA(config)#router eigrp 1
    Define EIGRP Network for Routing Protocol
    RouterA(config-router)#network 10.0.0.0
    Disable Auto Summarization
    RouterA(config-router)#no auto-summary
    This is me being strange and clean exiting from the routing protocol sub-section
    RouterA(config-router)#exit
    Enter the Serial Interface where to start defining your Hub on the Hub-and-Spoke Network
    RouterA(config)#interface serial 0/0
    Define summary for this interface
    RouterA(config-if)#ip summary-address eigrp 1 10.1.0.0 255.255.0.0
    RouterA(config-if)#exit
  2. The WAN is a Frame Relay cloud, and Router A is the hub in the hub-and-spoke configuration. Each Virtual Circuit (VC) is 56-kbps. Give commands to configure Router A for EIGRP over this Non-Broadcast Multi-Access (NBMA) Cloud.
    This Cisco.com Configuration Note should explain why the below is done.
    RouterA(config)#interface serial 0/0
    RouterA(config-if)#frame-relay encapsulation
    RouterA(config-if)#bandwidth 168
    RouterA(config-if)#exit
  3. Give the commands to configure Router B for EIGRP over this NBMA cloud.
    RouterA(config)#interface serial 0/0
    RouterA(config-if)#frame-relay encapsulation
    RouterA(config-if)#bandwidth 56
    RouterA(config-if)#exit

Resources:

Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Notes and Notices:

This is a part of my personal BSCI notes and research to assist myself in learning and understanding the concepts and theory for the BSCI exam. I learn by making notes reading and writing things down and wish to file them where I can’t lose them. These notes are not to be seen, judged or mistaken for replacements to Cisco recognized and authorized training which I personally support and attend and suggest you undertake if you are going for the BSCI Certification.

Enhanced Interior Gateway Routing Protocol – Scalable EIGRP – bandwidth command on subinterfaces

Published
by
Deon Botha
on September 5, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

Working from the my last couple of EIGRP posts I am going to try and crystallize some of the material found by working through questions found in Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

On what occasion should you consider configuring the bandwidth on subinterfaces?

In multipoint networks where one differing speeds allocated to the Virtual Circuits (VCs), it is easier to manage and maintain the configuration when each VC is logically treated as its own interface or point-to-point link.

In this case the bandwidth command can be configured on each subinterface which will allow different speed VCs while maintaining optimum use of each. The links that have the same configured Committed information rate (CIR) are represented as a single subinterface with a bandwidth that reflects the aggregate CIR of all the circuits.

Resources:

Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Notes and Notices:

This is a part of my personal BSCI notes and research to assist myself in learning and understanding the concepts and theory for the BSCI exam. I learn by making notes reading and writing things down and wish to file them where I can’t lose them. These notes are not to be seen, judged or mistaken for replacements to Cisco recognized and authorized training which I personally support and attend and suggest you undertake if you are going for the BSCI Certification.

Enhanced Interior Gateway Routing Protocol – Scalable EIGRP – Multipoint Serial Interfaces

Published
by
Deon Botha
on September 5, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

Working from the my last couple of EIGRP posts I am going to try and crystallize some of the material found by working through questions found in Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

If a multipoint serial interface uses five Permanent Virtual Circuits (PVCs) with Committed Information Rates (CIRs) of 56-, 128-, 128-, 128-, and 256-kbps, how would the bandwidth command be implemented on the interface?

EIGRP will assume even distribution of bandwidth on a multipoint interface. The bandwidth command serves two purposes in this situation,

IOS uses it as part of the routing metric and determines how much traffic it can send over an interface

One method method is to take the slowest PVC and calculate aggregate bandwidth

A better solution would be to split the PVC into subinterfaces so that each subinterfaces can be treated on its own.

Resources:

Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Notes and Notices:

This is a part of my personal BSCI notes and research to assist myself in learning and understanding the concepts and theory for the BSCI exam. I learn by making notes reading and writing things down and wish to file them where I can’t lose them. These notes are not to be seen, judged or mistaken for replacements to Cisco recognized and authorized training which I personally support and attend and suggest you undertake if you are going for the BSCI Certification.

Enhanced Interior Gateway Routing Protocol – Scalable EIGRP – Hello Timer Change

Published
by
Deon Botha
on September 5, 2008
in BSCI, BSCI Questions, Certification, Cisco Systems, Concepts and Constructs and Hello Timer
. 0 Comments

Working from the my last couple of EIGRP posts I am going to try and crystallize some of the material found by working through questions found in Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Give two reasons why you might want to change the hello timer?

One might want to change the hello timer would be to decrease the period between hellos (thus increasing the amount of hellos sent). This uses more bandwidth marginally but increases stability and causes faster convergences. This is a useful practice in WANs like non-broadcast multiple-access (NBMA) technologies where EIGRP assumes low bandwidth and sets hello timers to 60 seconds.

Resources:

Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Notes and Notices:

This is a part of my personal BSCI notes and research to assist myself in learning and understanding the concepts and theory for the BSCI exam. I learn by making notes reading and writing things down and wish to file them where I can’t lose them. These notes are not to be seen, judged or mistaken for replacements to Cisco recognized and authorized training which I personally support and attend and suggest you undertake if you are going for the BSCI Certification.

Enhanced Interior Gateway Routing Protocol – Scalable EIGRP – Variance Routes

Published
by
Deon Botha
on September 5, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

Working from the my last couple of EIGRP posts I am going to try and crystallize some of the material found by working through questions found in Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

When configuring the variance command, which routes can be used?

Routes that can be used when configuring variance are those held in the Topology Table and includes any feasible successor.

Resources:

Stewart, B,D., Gough, C (2008). CCNP BSCI Official Exam Certification Guide, Fourth Edition. Indianapolis: Cisco Press.

Notes and Notices:

This is a part of my personal BSCI notes and research to assist myself in learning and understanding the concepts and theory for the BSCI exam. I learn by making notes reading and writing things down and wish to file them where I can’t lose them. These notes are not to be seen, judged or mistaken for replacements to Cisco recognized and authorized training which I personally support and attend and suggest you undertake if you are going for the BSCI Certification.

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