a few links about this subject:
Defining Strategies to Protect Against TCP SYN Denial of Service Attacks
(has also basic explanations)
http://www.cisco.com/warp/public/707/4.html
Characterizing and Tracing Packet Floods Using Cisco Routers
http://www.cisco.com/warp/public/707/22.html
For
Sounds a little like it might have something to do with flow control. Have
you already tried toggling different flow control settings ? Usually
gibberish means the devices are talking but the characters are not properly
synchronized from one device to the other. Let us know how it works out.
I think that you can do this if you have 4 different subnet addresses to
use. I have only tried it with two using Advanced Server. If and when you
do, watch what choices you make because the Server may try to become a
rudimentary router for IP RIP, OSPF, IPX etc.not sure if that is what
you
what is the purpose of FECN?
a.To tell the router that a packet experienced congestion
b.To tell the router that packets it is sending to a remote site are
experiencing congestion
c.To tell the router that there is bandwidth available
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The "F" in FECN means forward, so I choose "a."
The packet arrives at the dest, notifying the dest that it experienced
congestion along the way, so that rules out "b." Which is actually the
correct answer if the question were "What is the purpose of BECN"
"c." is not a function of FECN nor
i am confused on communication type of ospf point-to-multipoint network
packet .
2 descriptions from jeff dolye's routing tcp/ip vol1 are as follow:
page417,2nd paragragh
routers on these networks(point-to-multipoint networks) do not
elect a dr and bdr , and because the networks are seen as
I will partially agree with you. I don't want to disclose the amount I make
online, but I work in NY, and I don't have a degree, but I have my MCSE, and
by the end of this week I should hopefully have my CCNP as well. Here its
very easy I think to get a decent job that will pay a good salary
Hi, I need information with Frf9-compression and which plataform I must
useI need compress a 128kbps link point to point in Frame Relay with
Frf9.
Thanks
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Jack
From what I remember - SNAP and VC-Mux are two differnet encapsulations for
layer 3 protocols over ATM. I think VC-mux only allows one protocol/vc
while SNAP (because of the additional header) allows multiple layer 3
protocols/vc of course at an additional cost of the SNAP header which I
Dear All,
I have noticed that when you order an ISDN PRI module for a modular router there are
two choices available. Balanced and Unbalanced. Could any one please tell me what the
difference is between the two and what is the advantage of using either one of them?.
I have also noticed a line
if your using compaq/3com/intel you can nic teaming.i.e using muliple
cards acting as one.400 instead of 100 meg
steve
From: "Shaw, Winston Mr." [EMAIL PROTECTED]
Reply-To: "Shaw, Winston Mr." [EMAIL PROTECTED]
To: "'L Reid'" [EMAIL PROTECTED], [EMAIL PROTECTED]
Subject: RE: 4 NET
I believe the answer is "B". FECN is bit set by a frame-relay network to
inform the DTE receiving the frame that congestion was experienced in the
path from Source to Destination.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
cslx
Sent: Sunday,
Which list was it supposed to go to? Thanks!
Francisco.
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Hi Willy!
Balanced and Unbalanced is a term carried over from transmission line
theory...ie., any form of energy transfer between two points.
(It overs data, microwave, telephone circuits, radio antenna, as well as
high-voltage power distribution!)
A balanced line uses two channels (ie.,
I haven't taken the lab yet, but from what I hear... anything up to
layer 1 issues (i.e. cabling). I don't think the would mess up the
router itself, though, other than leaving you locked out (which is not a
HW thing). As I said, I don't know for sure. Comments welcomed.
Francisco.
I don't have a console session in front of me, but wouldn't this be the
shortest way...
Router(enable)# wr t
Let me know if I'm wrong
- Dennis
-Original Message-
From: JL [mailto:[EMAIL PROTECTED]]
Sent: Saturday, November 18, 2000 10:35 PM
To: [EMAIL PROTECTED]
Subject: RE:
Looks like a trick question.
I would choose answer a.
Answer b corresponds to what is called the BECN.
The reason that it is a trick question is that the immediate reaction would
be to discard Answer a because FECN is not the only way to tell if a packet
experienced congestion.
Winston.
No, the shortest possible way would be to set up an alias and then use that.
For example create an alias "alias exec s copy run start"
That way a "copy run start" from the command prompt could be entered by
typing "s return"
When I disagree with a rational man, I let reality be our final
You could just enter "clear arp" this will force a refresh. If you
want to totally clear an entry shut/no shut the interface it was
learned on. Of course, make sure this isn't the interface you are using
for your telnet session |:)
Fred.
"Hinds, Jarrett (contractor)" wrote:
I believe, by
I currently work in a NOC and fail to see how it is a waste of the cert. I
troubleshoot a wide variety of equipment (remotely and with site techs on
the phone) relating to voice and data issues. I think this will in the long
run tend to make me a more well rounded person technically and allow me
It was my understanding that while the pre 11.3 commands would still work,
that were being de-emphasized in training classes and I was only trying to
be consistant with what I thought was valid not only for testing purposes,
but training also.
Gragg
-Original Message-
From: [EMAIL
I didn't intrepret the question as bridging AT. To route AT over Frame
one config is:
r1:
appletalk routing
int s 0
encap frame
frame-relay map appletalk 100.2 102 br
apple cable-range 100-100 100.1
apple zone frame12
r2:
appletalk routing
int s 0
encap frame
frame-relay map appletalk 100.1
I was about to purchase the subject but was curious if anyone else on here
had and what the opinion was.
Thank you in advance for your assistance.
Regards,
John Huston
[EMAIL PROTECTED]
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did anyone here can find any website that containt cisco or others CBT
files. I haven't found it yet. and don't forget where the site that containt
the files and of course username and password. thx.
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I still don't understand with cisco catalyst 5500 backplane. What does the
backplane mean for ? is there anybody can answer this beginner question ?
thank you.
moerdo
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Unfortunately I have that a lot of places could actually care less how many
certs you have...if you do not have a degree. Personally, I look at them and
think they must be smoking crack, but it is still a reality in some
industries/parts of the USA.
Gragg
-Original Message-
From: [EMAIL
FECN - Forward Explicit Congestion Notification
This is a bit within the address field which notifies the receiving device
that the network is experiencing congestion.
The end device (ie., router, FRAD etc.) is informed that congestion was
experienced on route...subsequent packets could be
jason are you using nt or 95.if nt upgrade your hyperterm app...it's not
sending the correct signal...las
From: "Jason Roysdon" [EMAIL PROTECTED]
Reply-To: "Jason Roysdon" [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: 804 problems after 'erase startup' and reload
Date: Sat, 18 Nov 2000
If you cannot telnet to the router, there is a possibility that a
"gratuitous arp" may do the trick. If the router recognizes these kinds of
arp packets it should update its cache. The broadcasted arp will have the
same source and destination Ip address and the new source MAC address. It is
used
I think the idea is versatility. Its nice that you want a desk job. You
open yourself up to more opportunities when you don't restrict yourself
though. Generally network types are a mixture anyway. Bottom line is you
set a goal and do it. When your done your a different place with a
different
A beginner you say ? Have no fear, even the non-beginners are drowning in IT
terminology. There are many words and acronyms which have been created,
dropped and re-created in this field.
In concept, the "backplane" is the physical part of the switch(usually found
in the "back" of the
fat fingering the keyboard strikes again...the first sentence should have
read "Unfortunately, I have been to a lot of places that could actually care
less how many certs you haveif you do not have a degree." maybe I should
consider typing classes before pursuing anymore certs...lol
Gragg
I don't know if this has been posted before, there
are some major changes in the R/S Lab. This is from the Cisco Web Site. Start
studying up on things like QoS, Security, etc.
Effective immediately, the following topics have been removed from the lab
exam content:
LAT
DECnet
The biggest caution I'd give about Cisco's IOS support for DHCP is that if
you bounce the router, it forgets all the dynamic leases. It does have the
ability to log leases to an ftp server, but if you're going to have to set
up an ftp server, might as well have that box do DHCP as well.
Actually, just to be picky, "s ru" also works. Although you usually have to
type in enough letters to make a command unambiguous, "show" is an exception, as
it can be abbreviated to "s".
However, I suspect the original questioner actually wanted to know about
aliases, which somebody else has
My first was a week late, the second one day early. Anyway, my 2 1/2 year
old knows how to spot a router and a hub (well, hubs and switches are a bit
hard to tell the difference between). He already has fun with patch cords
and such. I just have to make sure I keep my routers up high enough so
I know I've seen the command to do this, I just can't remember it :).
What is the command to enter on a terminal server so that if you have
sessions open, and hit return, it will not return you to a session?
The default behaviour is to return you to the first open session when
you hit return.
Hi All,
I have problem on my Sun Solaris 2.7 Server. I have installed Netscape
Commmunicator on my server, after installation when I try to run netscape I
saw following message:
Xlib: connection to ":0.0" refused by server
Xlib: Client is not authorized to connect to Server
Error: Can't open
18. Entering the mls rp ip command on an interface before assigning that
interface to a VTP domain.
1.. prohibits the interface from interacting with any switches.
2.. prohibits that interface from becoming the management interface.
3.. forces the adminstrator to manually assign the VLAN
Hello group! , I have been given the task of coming up
with projects for next year for our wide area network
that would fall under these three catagories
1. Reliability ( making network more reliable)
2. Documentation
3. New technology
So far some of the things i have been able to come up
with
What sort of Network Management stations do you have? If you don't have
anything, this might help with reliability, documentation and new tech all
at once.
- Dennis
-Original Message-
From: beth shriver
To: [EMAIL PROTECTED]
Sent: 11/19/2000 6:30 PM
Subject: suggestions please! -
Hi All,
Would you pls give me your advise for pass the
Support exam ?
Is it enough to pass the exam by using CIT book
from CiscoPress only ?
TIA.
Best Regards,
Janto Cin
Put all the configs into CVS and keep revision control on them.
Setup a TACACS+ server to centtral password control.
Setup MRTG to monitor all of your interfaces.
Setup a lab.
Get a few copies of Visio, use them.
andy
On Sun, 19 Nov 2000, beth shriver wrote:
Hello group! , I have been
On Sun, 19 Nov 2000, beth shriver wrote:
Hello group! , I have been given the task of coming up
with projects for next year for our wide area network
that would fall under these three catagories
1. Reliability ( making network more reliable)
unless we know the topology how can we comment on
Hi all,
Iam having a 2511 router. IS it possible to configure other routers
from the access server,after configuring it,by connecting each async line
of the 2511 to each console port of the other routers?If so how?
I would appreciate if anyone can help.
Thanks in advance,
SSS
Hi
Janto,
I the support Exam yesterday, I have got 850. It was very
difficult, and unexpectable if you going to pass or not. But any way, I used the
Cisco Press Book only and the Boson Exam 1,2.(did not help that
much).
Good luck for your exam.
Ehab
CCNP,
ASE, MCSE, CNE
Hi
How many people would finished CCNP security 2.0 ? Do you all have some idea ?
Sakthi
_
Chat with your friends as soon as they come online. Get Rediff Bol at
http://bol.rediff.com
Participate in crazy auctions at
I think if you're not smart enough to tell that this is a Cisco board,
you're definitely gonna have a hard time with the problem you have at hand.
kenneth
"Ngo Van Dzung" [EMAIL PROTECTED] wrote in message
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Hi.. Dear all,
May I ask you how to install or configure TACACS+ daemon server in Linux or
Sun Solaris platform? All the information that I get is about how to
configure TACACS+ on router or Access server and point to TACACS+ server
using tacacs-server host command but it doesn't cover how
Hello
I am now configing a ATM circuit ...but faac a problem
My first machine is a 7200 VRX with a ATM OC-3 interface card (slot 2 ,
interface 0)
and a machine which is a ERX router
my configuration for the 7200 is
int atm2/0
ip address 192.168.0.1 255.255.255.0
no shutdown
atm pvc 10 20 100
The book is okay,
would also advice you to try out the commands on a router and a switch..
Go through the book and know your frame relay and ATM well.
Regards
Adetola
-Original Message-
From: Janto Cin [SMTP:[EMAIL PROTECTED]]
Sent: Monday, November 20, 2000 4:17 AM
To: [EMAIL
It seems to me your missing a map list and map group. Like below. I assume
you're not using inverse ARP.In any case, I can't remember why you can't
ping a local interface, but it's normal. (route caching?)
interface atm 2/0
ip address 192.168.0.1 255.255.255.0
no keepalive
map-group
here is what the cisco web site says that "
Platforms
The CBAC feature is supported on the following
platforms:
Cisco 1600 series
Cisco 2500 series"
is this correct ? cbac feature is supported by a
IOS version. I mean it should have been worded as
following IOS versions support cbac feature.
Hi;
I just want to say thank you for everyone in the group who provide
me information about MCNS.
On the road to CCIE (R/S) written and Lab.
Best Rgds;
Vincent
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just throw them into the pci slots (if there are that many)...and just
go from there...
but why 4?...i can see 2...one for the LAN and one for the redunduncy...or
as a firewall
but 4??...do tell..
Deepak
L Reid wrote:
How do I set up four network cards in one NT 2000
server?
Is there a book
1st question
Any security issues with ATM?...i know it kinda acts like a VPN (and
those are pretty secure), but should i be running IPSEC or some other
type of encryption?
3661's latest IOS on a dedicated OC3?/...im thinking what if some1
vampire taps the line??..can they see the data??..
2nd
Vincent,
Which resources did you use? I scheduled my MCNS for December 18th.
Thanks
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Vincent Chong
Sent: Sunday, November 19, 2000 10:00 PM
To: [EMAIL PROTECTED]
Subject: Passed MCNS
Hi;
I just
Windows 2000. It's never had a problem before. I use Tera Term Pro on an
average of a dozen routers a week, no problems. I tested both apps on 3
other routers, no problems. It's not the laptop, the rollover, or the db9
(I tried 2 of each, both worked fine on the other routers). Also, I was
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