CCENT/CCNA [H] study group

AMD_Gamer said:
Is there a difference between bpduguard and Cisco Root Guard? both are mentioned in the book but there is no command for Root Guard?

Root Guard lets traffic and BPDU's flow but shuts down the port if a superior bridge ID enters the port to prevent the connected switch from becoming root, according to the book.
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From what I understand, BDPU Guard stops unwanted switches from being added to the network. Root Guard allows switches to be added to the network, but, like you said, disallows them to advertise a superior BID and become the root bridge.
 
Yeah Root Guard is never mentioned in any of the material I used to study. In fact I didn't know about it until now.
 
If I want to take the two tests separately, would it be better to go with one CCNA study guide or separate ICND1 and ICND2 study guides?
 
devin_m said:
Any reason you decided against Cisco press?
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I didn't notice it in the search results.

I'm actually about to graduate from college in two weeks. I've worked a lot with Cisco switches and routers, mostly 2811's, 2960's, and 3560's, I just don't have any paid experience. I can configure everything from VLANs, STP, VTP, DHCP, RIPv2, EIGRP, OSPF, Frame Relay, SSH, ACL's, etc in my sleep, and I'd say the same about my knowledge of networking concepts. I thought about taking the one CCNA exam by itself, but after hearing that it's pretty difficult even if you have a basal knowledge, I decided to take the two separately.

After further consideration, I've decided on these two.

ICND1

ICND2/CCNA
 
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Lord Nassirbannipal said:
I didn't notice it in the search results.

I'm actually about to graduate from college in two weeks. I've worked a lot with Cisco switches and routers, mostly 2811's, 2960's, and 3560's, I just don't have any paid experience. I can configure everything from VLANs, STP, VTP, DHCP, RIPv2, EIGRP, OSPF, Frame Relay, SSH, ACL's, etc in my sleep, and I'd say the same about my knowledge of networking concepts. I thought about taking the one CCNA exam by itself, but after hearing that it's pretty difficult even if you have a basal knowledge, I decided to take the two separately.

After further consideration, I've decided on these two.

ICND1

ICND2/CCNA
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I read Todd Lammle's book, as well as the the CCNA for Dummies and watched the CBT Nuggets but the best books I read are the Cisco Press books. I read those last and everything before it seemed to be lacking in the depth that the Official Certification Guide, did sure they were a little more dry then Todd's book but I would take depth of knowledge over fun to read any day.
 
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devin_m said:
I read Todd Lammle's book, as well as the the CCNA for Dummies and watched the CBT Nuggets but the best books I read are the Cisco Press books. I read those last and everything before it seemed to be lacking in the depth that the Official Certification Guide, did sure they were a little more dry then Todd's book but I would take depth of knowledge over fun to read any day.
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Then Cisco Press it is.
 
ICND2 exam next monday!
I'm currently in a bootcamp for a week, but before this i read the Cisco ICND2 book and watched CBT videos. I'm still not scoring real great on the Boson exams but i hope to be up to 80% by saterday. I still have some areas of study that are fuzzy (hold down times, eigrp unequal load balancing, DHCP pools, NAT pools).

I'm drowning in CCNA resources (pdf, video, pod casts, books)
 
TSaL said:
ICND2 exam next monday!
I'm currently in a bootcamp for a week, but before this i read the Cisco ICND2 book and watched CBT videos. I'm still not scoring real great on the Boson exams but i hope to be up to 80% by saterday. I still have some areas of study that are fuzzy (hold down times, eigrp unequal load balancing, DHCP pools, NAT pools).

I'm drowning in CCNA resources (pdf, video, pod casts, books)
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Good Luck!
 
I just started the Cisco Network Academy, downloaded Packet Tracer, looking forward to learning more.
 
robscomputer said:
I just started the Cisco Network Academy, downloaded Packet Tracer, looking forward to learning more.
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I start next week. Was looking thru the review sections of some of the chapters, and I've already got a handle on most of it, however getting access to Packet Tracer will be nice. Gotta say, I'm pleased with how thorough the material is, covering plenty of media types and a good amount of background.

I did pre-order the Third Edition of the Cisco Press CCNA ICND1/ICND2 pack. It's ~$38 on Amazon and is due out late October. Link From that I may end up just taking ICND1 a bit early rather than waiting until the end of the 2nd semester. If I do go that route, I may end up self-studying for the ICND2. Could take less time and save me the cost of 6-9 credit hours and 2-3 books, but it depends on the materials. Sometimes with time constraints, having the extra structure pays off, and the extra time helps improve retention/depth. I'll know more when I have those ICND books in hand. In the meantime, going to give the Cisco Academy stuff a go.

Edit: Corrected price and added link to Amazon item.
Edit2: More information on the updated set: Link (see description; also sample content lists whats included.. seems very nice.)
 
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damacus said:
I start next week. Was looking thru the review sections of some of the chapters, and I've already got a handle on most of it, however getting access to Packet Tracer will be nice. Gotta say, I'm pleased with how thorough the material is, covering plenty of media types and a good amount of background.

I did pre-order the Third Edition of the Cisco Press CCNA ICND1/ICND2 pack. It's ~$38 on Amazon and is due out late October. Link From that I may end up just taking ICND1 a bit early rather than waiting until the end of the 2nd semester. If I do go that route, I may end up self-studying for the ICND2. Could take less time and save me the cost of 6-9 credit hours and 2-3 books, but it depends on the materials. Sometimes with time constraints, having the extra structure pays off, and the extra time helps improve retention/depth. I'll know more when I have those ICND books in hand. In the meantime, going to give the Cisco Academy stuff a go.

Edit: Corrected price and added link to Amazon item.
Edit2: More information on the updated set: Link (see description; also sample content lists whats included.. seems very nice.)
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I just bought the current version of the books, should have waited. lol

The class so far is pretty nice, but my only gripe so far it's done in Flash and I can't watch from my iPad.
 
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TSaL said:
ICND2 exam next monday!
I'm currently in a bootcamp for a week, but before this i read the Cisco ICND2 book and watched CBT videos. I'm still not scoring real great on the Boson exams but i hope to be up to 80% by saterday. I still have some areas of study that are fuzzy (hold down times, eigrp unequal load balancing, DHCP pools, NAT pools).

I'm drowning in CCNA resources (pdf, video, pod casts, books)
Click to expand...

What do you find the hardest to study on the ICND2?
 
I am confused as to why and when you should use manual summarization? It appears that all routing protocols except OSPF use autosummarization by default. What i got from reading the ICND2 Cisco book is that the only time you need to use "no auto-summary" is for clasful routing protocols on discontiguous networks?

Can somebody explain this to me.
 
You never really want to use auto-summarization. Modern networks do not live on classful boundaries.

As for manual summarization. This is used all the time in larger networks. Say you have a WAN with 30 sites. You give each site a /16, from the 10/8 space, which is then chopped up into several /24s (or smaller) for various VLANs at the site. There's no reason to advertise 11ty /24s into the WAN if the site is running a single, contiguous /16.

So 30 sites with a /16 per site, each site is using 30 /24s (conservative number considering how large a /16 really is). Without summarization, your WAN has 900 prefixes. If each site advertises only its /16, you have 30 prefixes.
 
Vito_Corleone said:
You never really want to use auto-summarization. Modern networks do not live on classful boundaries.
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I get that but also most modern networks don't use RIP and IGRP right?

As for manual summarization. This is used all the time in larger networks. Say you have a WAN with 30 sites. You give each site a /16, from the 10/8 space, which is then chopped up into several /24s (or smaller) for various VLANs at the site. There's no reason to advertise 11ty /24s into the WAN if the site is running a single, contiguous /16.

So 30 sites with a /16 per site, each site is using 30 /24s (conservative number considering how large a /16 really is). Without summarization, your WAN has 900 prefixes. If each site advertises only its /16, you have 30 prefixes.
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I get what summarization does but why not leave manual summarization on in this example?
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AMD_Gamer said:
Vito_Corleone said:
I get that but also most modern networks don't use RIP and IGRP right?



I get what summarization does but why not leave manual summarization on in this example?
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IGRP is dead. RIP is around, but not all that common in decent size environments. EIGRP and BGP are obviously very common and they do auto-summarization. I'm not sure what exactly you're asking here.

Do you mean why not leave auto-summarization on? If you leave auto-summarization on, it will summarize to classful boundaries, so all 30 sites would be injecting the same 10/8 into the WAN.
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Vito_Corleone said:
AMD_Gamer said:
IGRP is dead. RIP is around, but not all that common in decent size environments. EIGRP and BGP are obviously very common and they do auto-summarization. I'm not sure what exactly you're asking here.

Do you mean why not leave auto-summarization on? If you leave auto-summarization on, it will summarize to classful boundaries, so all 30 sites would be injecting the same 10/8 into the WAN.
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That is what I am asking. Why not leave auto-summarization on for classless networks? What i got out of the book is you only run into trouble with clasful routing protocols and discontiguous networks when using auto-summarization?

So auto-summarization will also summarize to the class A, B, or C network boundary for all routing protocols?
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AMD_Gamer said:
What do you find the hardest to study on the ICND2?
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1.)Right now I'm trying to wrap my head around some frame-relay stuff. Like when to use:

router(config-if)#Frame map ip "remote router int" "local DLCI" broadcast

over

router(config-if)framer-relay interface-dlci "local DLCI"

I understand the later is used for point-to-point.

2.)Converting a dynamic nat to nat overload .............:( I can read it and see how its done but when it comes to doing it from memory i get messed up.



Oh well 2 day until i pass :p *crosses fingers*
 
Vito_Corleone said:
AMD_Gamer said:
IGRP is dead. RIP is around, but not all that common in decent size environments. EIGRP and BGP are obviously very common and they do auto-summarization. I'm not sure what exactly you're asking here.

Do you mean why not leave auto-summarization on? If you leave auto-summarization on, it will summarize to classful boundaries, so all 30 sites would be injecting the same 10/8 into the WAN.
Click to expand...

Ok i think i got it now.

-autosummarization ALWAYS summarizes to the class A, B, or C boundary and never summarizes a group a subnets?

-To summarize a group of subnets within a classful network you must use manual summariztion.

I was confused because i did not catch in the Cisco ICND2 book that autosummarization ALWAYS summarizes to the classful boundary. I thought it would automatically summarize the group of subnets it knows about like you would want to do with manual summarization.

How come it would not automatically summarize a known group of subnets instead of the entire classful network? I figured it would be called something different like auto-classful-summarization instead of autosummarization. The way i read it in the Cisco book is that it just does manul summarization automatically for you.

So if an ISP or company is given a block from a classful network to use it would use manual summarization for all of their subnets to let the rest of the internet know?
Click to expand...
 
TSaL said:
1.)Right now I'm trying to wrap my head around some frame-relay stuff. Like when to use:

router(config-if)#Frame map ip "remote router int" "local DLCI" broadcast

over

router(config-if)framer-relay interface-dlci "local DLCI"

I understand the later is used for point-to-point.

2.)Converting a dynamic nat to nat overload .............:( I can read it and see how its done but when it comes to doing it from memory i get messed up.



Oh well 2 day until i pass :p *crosses fingers*
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eek! i have not got to that yet.
 
TSaL said:
1.)Right now I'm trying to wrap my head around some frame-relay stuff. Like when to use:

router(config-if)#Frame map ip "remote router int" "local DLCI" broadcast

over

router(config-if)framer-relay interface-dlci "local DLCI"

I understand the later is used for point-to-point.

2.)Converting a dynamic nat to nat overload .............:( I can read it and see how its done but when it comes to doing it from memory i get messed up.



Oh well 2 day until i pass :p *crosses fingers*
Click to expand...

The first one is usually when you have a point to multipoint or point to point without the use of sub-interfaces.
The second one is if you are doing a frame relay connection via the hub of the frame-relay network is using sub interfaces i.e.:
R1
Physical interface Serial 0/0 - uses no Frame-Map statements
Logical interface Serial 0/0.1 & 0/0.2 - uses frame-map statements that would connect to R2&R3 via the local DLCI.

Sub-interfaces would use a basic frame-map command of just specifying the local DLCI, where as P2MP would use local DLCI to remote IP.
 
AMD_Gamer said:
That is what I am asking. Why not leave auto-summarization on for classless networks? What i got out of the book is you only run into trouble with clasful routing protocols and discontiguous networks when using auto-summarization?

So auto-summarization will also summarize to the class A, B, or C network boundary for all routing protocols?
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Think about it this way:

You have two routers that lead to the end networks 192.168.x.x

You have end networks off R1 that is 192.168.0.0 /24 & 192.168.1.0 /24
You have end networks off R2 that is 192.168.2.0 /24 & 192.168.3.0 /24

When the routes are advertised to the WAN they both Auto-Summarize them to 192.168.0.0 /16, so routers on the other side of the WAN will see that route and think that each router is just an alternate route to the same network, so it may end up sending a packet destined to 192.168.1.50 to R2 or a packet destined for 192.168.2.50 to R1 because they are both advertising the same subnet of /16 because those more specific subnets of /24 are in the /16.
You should specify the routes your self otherwise the router is going to use up an entire subnet that is also being used on another router.
Instead of each router advertising 192.168.0.0 /16 you need to have each router advertising their more specific routes.
 
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AMD_Gamer said:
Vito_Corleone said:
Ok i think i got it now.

-autosummarization ALWAYS summarizes to the class A, B, or C boundary and never summarizes a group a subnets?

-To summarize a group of subnets within a classful network you must use manual summariztion.

I was confused because i did not catch in the Cisco ICND2 book that autosummarization ALWAYS summarizes to the classful boundary. I thought it would automatically summarize the group of subnets it knows about like you would want to do with manual summarization.

How come it would not automatically summarize a known group of subnets instead of the entire classful network? I figured it would be called something different like auto-classful-summarization instead of autosummarization. The way i read it in the Cisco book is that it just does manul summarization automatically for you.

So if an ISP or company is given a block from a classful network to use it would use manual summarization for all of their subnets to let the rest of the internet know?
Click to expand...

Also, the big thing about manual summarization, you can summarize non- Class A/B/C classes. subnets that branch into smaller subnets, at the access router from that neighbourhood, you wouldn't want to send routes back to the main ISP router for every house. With manual summarization, you can change that so that it summarizes the entire neighbourhood into one subnet so that there are less routes to see from the ISP perspective.
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ShadowStriker said:
AMD_Gamer said:
Also, the big thing about manual summarization, you can summarize non- Class A/B/C classes. subnets that branch into smaller subnets, at the access router from that neighbourhood, you wouldn't want to send routes back to the main ISP router for every house. With manual summarization, you can change that so that it summarizes the entire neighbourhood into one subnet so that there are less routes to see from the ISP perspective.
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So what i posted for my idea is correct? does it appear that I have it now?
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