CCIE Pursuit Blog

April 30, 2009

Core Knowledge Question of the Day: 30 April 2009

Filed under: Cisco,Cisco Certification,IOS,OSPF,Question Of The Day — cciepursuit @ 4:00 am

Which of the OSPF stub areas available in IOS is a Cisco proprietary stub area?

Highlight for answer: The NSSA Totally Stub Area is a Cisco proprietary OSFP stub area.

April 29, 2009

Core Knowledge Question of the Day: 29 April 2009

By default, any single EIGRP process may use up to what percentage of the configured bandwidth on any link during periods of network convergence?

Highlight for answer: 50

April 28, 2009

Cisco Documentation: New Configuration Guide Security Categories

Every CCIE candidate should know by now that they’ll want to be intimately familiar with the Cisco Documentation site before attempting the lab exam.  You’ll also want to note that the documentation site is still changing.  Thankfully Cisco denotes the changes with a bright red ‘New!’.

Case in point: I was looking up some CBAC information this morning and found that the 12.4 Security Configuration Guide documentation had been reorganized:

Security and VPN

* Cisco IOS Security Configuration Guide: Secure Connectivity, Release 12.4 New!
* Cisco IOS Security Configuration Guide: Securing the Control Plane, Release 12.4 New!
* Cisco IOS Security Configuration Guide: Securing the Data Plane, Release 12.4 New!
* Cisco IOS Security Configuration Guide: Securing User Services, Release 12.4 New!

It’s a very good idea to check the location of various technologies (even the ones you know cold) on the Cisco Documentation site in the days before you take the lab.  It’s better to spend a few minutes navigating a new structure outside of the lab than in the lab.  🙂

Core Knowledge Question of the Day: 28 April 2009

Which well known BGP community is used in confederation scenarios to prevent sending packets outside the local AS?

Highlight for answer: Local-AS

April 27, 2009

Core Knowledge Question of the Day: 27 April 2009

Give at least two possible reasons as to why the prefix is experiencing a RIB-failure:

R1> sh ip bgp
BGP table version is 5, local router ID is
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure
Origin codes: i – IGP, e – EGP, ? – incomplete

Network          Next Hop            Metric LocPrf Weight Path
r>                   0    110      0 300 i
*>                   0    160      0 300 i

Highlight for answer: Generally this is due to the existence of a route with a lower AD in the IP routing table.  This can also be due to a memory error or the number of routes in VRF exceeding the route-limit configured under the VRF instance (outside of the scope of the Routing and Switching lab…for now 🙂 )

April 24, 2009

Core Knowledge Question of the Day: 24 April 2009

To be in compliance with the BGP synchronization rule, there must be a match for the prefix in the IP routing table in order for an internal BGP (iBGP) path to be considered a valid path.  What additional criteria must an OSPF route meet?

Highlight for answer: The OSPF router ID must match the BGP router ID of the iBGP neighbor.

April 23, 2009

Rumored Changes To CCIE R&S Lab

Filed under: Cisco,Cisco Certification — cciepursuit @ 12:07 pm
Tags: , , , , ,

As Networkers approaches the rumors about CCIE lab changes start popping up.  Cisco has a history of announcing changes to the various tracks at their annual convention and this year is no different.  IPexpert’s blog recently posted this:

I thought I’d post the stuff I’ve heard from a reliable source connected to the CCIE team and Cisco’s learning organization.

(*Note: None of this stuff has been confirmed or announced by Cisco – again, it’s just “buzz” right now, but I am pretty confident that it’s legitimate info.)

Supposedly – in early May – Cisco will be announcing a change to the CCIE R&S lab exam. This change will consist of the additions of MPLS and Layer 3 VPN. There will also be an extensive Troubleshooting portion added to the lab exam. These changes are expected to make up 30% of the lab – and be effective beginning in October 2009.

—Read More Here—

As Wayne noted, this is all speculation at this point. BUT this does sound like an expected evolution of the CCIE R&S lab and the time-frame is consistent with past changes.  MPLS has been on the written exam for about 1.5 years now and it is pretty much a ‘must know’ topic in the field.  I welcome the addition of a troubleshooting section.  Hopefully Cisco will ditch the Core Knowledge questions at the same time.  🙂

Of course, if this is announced in May, you can expect a run on open lab dates as candidates will rush to get their lab scheduled before the changes are implemented.

Can’t We All Just Get Along

Filed under: Cisco,Cisco Certification,IOS — cciepursuit @ 8:00 am
Tags: , , , , ,

Rack1R1(config)#router bgp 1100
Rack1R1(config-router)#neighbor remote-as 1100
Rack1R1(config-router)#neighbor prefix-list PREFIX in
Rack1R1(config-router)#neighbor distr
Rack1R1(config-router)#neighbor distribute-list DISTRIBUTE in
Prefix/distribute list can not co-exist

It sounds like Mr. Prefix-list and Mr. Distribute-list need to sit down and iron out their differences.  Or this could be the problem:

The attributes prefix-list and distribute-list are mutually exclusive, and only one command (neighbor prefix-list or neighbor distribute-list) can be applied to each inbound or outbound direction for a particular neighbor.

April 21, 2009

Core Knowledge Question of the Day: 21 April 2009

Filed under: Cisco,Cisco Certification,Question Of The Day — cciepursuit @ 1:46 pm

What OSPF router type connects one or more areas to the backbone and acts as a gateway for interarea traffic?

Highlight for Answer: Area Border Router (ABR)

April 20, 2009

Core Knowledge Question of the Day: 20 April 2009

What is the default OSPF network for the following media types: Ethernet, Token Ring, and FDDI?

Highlight for answer: Broadcast

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