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Monthly Archive for August, 2008

Enhanced Interior Gateway Routing Protocol – Tables – Active and Passive Mode

Published
by
Deon Botha
on August 13, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

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

When Does EIGRP place a network in active mode?

When there is a change (metric or link state) in EIGRP and there is no feasible successor available in the Topology Table a network is placed into active mode and queries are sent to neighbouring devices asking if they may have a path to the network.

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 – Tables – EIGRP Algorithm

Published
by
Deon Botha
on August 13, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

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

What EIGRP Algorithm is run to create entries for the Routing Table?

EIGRP runs the Diffusing Update Algorithm (DUAL) on the Topology Table to ensure a loop-free topology and find the best paths to destinations to put into the Routing Table.

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 – Tables – AD and FD

Published
by
Deon Botha
on August 13, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

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

What is Advertised Distance (AD) in EIGRP, and how is it distinguished from the Feasible Distance (FD)?

The Advertised Distance (AD) is the metric reported by a neighbour and is the cost to a given end destination but does not include the cost of the first-hop (physical interface link to the neighbour).

The Feasible Distance (FD) is also a metric reported by a neighbour but includes the cost of the first-hop (physical interface link to the neighbour).

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 – Tables – Topology Table

Published
by
Deon Botha
on August 13, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

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

What is an EIGRP Topology Table, and what does it contain?

The EIGRP Topology Table is the link between the (1) Network Table and (2) Routing Table.

The Topology Table uses the information from the Neighbour Table and holds all valid routes within the network including successors and feasible successors.

The Topology Table runs the DUAL algorithm and passes the best route onto the Routing Table for a specific routed protocol (IPv4, IPv6, IPX, AppleTalk).

The Topology Table contains:

  • Whether a route is passive or active.
  • Whether an update has been sent to the neighbour.
  • Whether a query packet has been sent to a neighbour
  • That a reply packet has been sent in response to a query packet from a neighbour.
  • Prefixes, masks, interface, next-hop, and Feasible and Advertised Distance from remote networks

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 – Tables – EIGRP Holdtime by default

Published
by
Deon Botha
on August 13, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

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

How long is the holdtime by default?

The EIGRP holdtime is by default 3x (three times) that of the Hello.

  • LAN = Hello timer 5 seconds, Holdtime 15 seconds.
  • DS1 (1.5Mbps) or slower WAN links = Hello timer 60 second, Holdtime 180 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 – Tables – RTP Packets via EIGRP

Published
by
Deon Botha
on August 13, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

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

Which EIGRP packets are sent reliably?

Updates, Query and Reply packets are sent reliably using RTP.

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 – Tables – Designing a Scalable EIGRP Network

Published
by
Deon Botha
on August 13, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

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

State two rules for designing a scalable EIGRP network

  1. Assign addresses and organize links so that natural points for summarization exist. A hierarhical network design IOW.
  2. Provide sufficient hardware resources (mem and CPU) on network devices.
  3. Use sufficient bandwidth on the WAN links.
  4. Use filters to limit advertisements.
  5. Monitor the network.

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 – Tables – Recalculation of Topology Table

Published
by
Deon Botha
on August 12, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

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

When does EIGRP recalculate the Topology Table?

EIGRP recalculates the Topology Table whenever a new network is added causing a change of sate of a physical interface, successors change due to a change in the metric value, or a network is lost. This means that the Topology table will be recalculated whenever Update packets are received, query packets are received or reply packets are received.

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 – Tables – Update vs Query

Published
by
Deon Botha
on August 12, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

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

What is the difference between an update and a query?

An update packet in EIGRP is the advertisement of routes when there is a change on the network.

A Query in EIGRP is used to ask neighbouring devices about paths (see this question) for which a best path has been lost.

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 – Tables – Timers in Neighbour Table

Published
by
Deon Botha
on August 12, 2008
in BSCI, BSCI Questions, Certification and Cisco Systems
. 0 Comments

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

What times are tracked in the Neighbour Table?

There are three timers tracked in the Neighbour Table namely the holdtime, Retransmission Timeout (RTO) and the Smooth Roundtrip Time (SRTT).  The values represent:

  • Holdtime the amount of time that a router (3 x Hello Timer by default) waits for a Hello packet from a neighbour before declaring that neighbour down and clearing information relating to that neighbour from the database.
  • Retransmission Timout (RTO) is the amount of time a router will wait on a connection orientated packet to be ACK before retransmitting.
  • Smooth Roundtrip Time (SRTT) is the time in milliseconds that calculates the RTO. This is the time it takes a packet to be send and an ACK to be received.

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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