Certifications Unleashed » Cisco

TFTP transfer fails with a Not enough space on device error message

sanix — Sun, 04 Jul 2010 22:41:47 +0000

While upgrading my IOS, I was getting the error message that there is not enough space available for the new IOS. I was issuing the following command:

Certhacker#copy tftp flash:
Address or name of remote host [192.168.1.1]?
Source filename [c2600-i-mz.121.T.bin]? c2600-i-mz.121-1.T.bin
Destination filename [c2600-i-mz.121-1.T.bin]?
Loading c2600-i-mz.121-1.T.bin from 192.168.1.1 (via Serial0/0): !
%Error copying tftp://192.168.1.1/c2600-i-mz.121-1.T.bin (Not enough space
on device)
Certhacker#

Resolution:

The solution to this problem is to delete the existing files residing in the flash. To see the items in flash, issue the following command:

Certhacker#dir flash:

If you want to backup the files currently residing on flash, issue the following command:

Certhacker#copy flash tftp

This command will ask for the file name which you want to copy to tftp server.

When you’re done with the backup, issue the following command to delete all the files in flash:

Certhacker#erase flash:

This will delete all the files in flash and you’ll be able to install the new IOS without the error message which you were previously getting.

Pass4sure CCNA:Set Router modes for Cisco router

admin — Wed, 24 Mar 2010 18:05:23 +0000

set router modes for cisco router,enable mode,exec,config mode. pass4sure help you pass any IT exam!

Cisco Telepresence Magic

Botty — Sun, 28 Feb 2010 19:56:26 +0000

Cisco Telepresence Magic. Interesting video..

How To Limit Telnet Access To Specific Networks In Cisco Router IOS

sanix — Sat, 05 Sep 2009 15:38:07 +0000

As the title suggests, I want to have a limited access to my router through telnet. I want only specific networks to be able to telnet my router. All others should be blocked from telnetting the router.

So let’s start:

Enter global config mode

Certhacker#configure terminal
Enter configuration lines, one per line. End with CNTL/Z
Certhacker(config)#

Create Access list to permit a network

Certhacker(config)#access-list 20 permit 192.168.1.0 0.0.0.255

This will create an access list no. 20 which will permit the network 192.168.1.0/24. Now we need to apply this access list to a vty line.

Apply access list to router’s virtual terminals

Certhacker(config)#line vty 0 4
Certhacker(config)#access-class 20 in

Now see the access list applied

Certhacker#show access-list

This will show the recently applied access list 20. Please note that there is an implied deny all at the end of each access list that will deny all other networks other than the permitted ones.

Try this tutorial live on the following simulation lab:

CCNA Simulation Lab Access List Tutorial

How To Change Hostname In Cisco IOS

sanix — Wed, 02 Sep 2009 10:49:40 +0000

Hostname is the name of the router. It’s up to us what we name it. It’s like giving a name to our own systems. If we are using a command line interface to access the router or switch, then we can see the current name of the device before the prompt.

To change the name of the Cisco device, follow the commands given below:

Houston>enable
Password:
Houston#configure terminal
Houston(config)#hostname Certhacker
Certhacker(config)#

You can see that the router name has changed from Houston to Certhacker.

Practice real Cisco Lab environment with FREE Dynagen — Best Cisco Emulator ever

adnan — Wed, 20 May 2009 18:33:50 +0000

Dynamips is a Cisco router emulator written by Christophe Fillot. It emulates 1700, 2600, 3600, 3700, and 7200 hardware platforms, and runs standard IOS images. In Chris’ own words:

This kind of emulator would be useful to:

· Be used as a training platform, with software used in real world. It would allow people to become more familiar with Cisco devices, Cisco being the world leader in networking technologies ;

· Test and experiment features of Cisco IOS ;

· Check quickly configurations to be deployed later on real routers.

Dynagen software can be downloaded as follows:

http://sourceforge.net/project/showfiles.php?group_id=160317&package_id=192619

In addition, you can get started quickly with using this software by the following tutorial:

http://dynagen.org/tutorial.htm

Note: you must have winpcap on your computer to run dynagen. You can download it as follows:

http://www.winpcap.org/install/default.htm

For more information, feel free to post your queries.

(reference:http://dynagen.org/)

Download Ebook: Cisco–The Complete Reference

sanix — Tue, 12 May 2009 09:35:03 +0000

Cisco: The Complete Reference is a lofty title for a book, and one that you could take
in a multitude of different directions. Some think that a book with this title should be
the “end all and be all” of Cisco books, including every possible Cisco technology and
the most obscure details of those technologies. Unfortunately, that book would
consist of over 50,000 pages, and it would be obsolete by the time you got it. (Cisco
has been trying for years to write that book; it’s called the Cisco web site, and it’s still
not complete.)
Rather, the tactic I chose for this book was to cover the most commonly used
technologies in most networks, with detailed explanations and a focus on practical
understanding and use. In most cases, although obscure details are somewhat
interesting, they really don’t help much unless you are a contestant on “Cisco
Jeopardy.” Therefore, I wrote a book that I feel people have the most need for: a
book designed to explain Cisco technology to the average network administrator or
junior network engineer who may need to understand and configure Cisco devices.
The goal of this book is not to help you pass tests (although it may do that) and not to
be the final word on any subject. Rather, the goal is to give you a complete
understanding of Cisco technologies commonly used in mainstream networks, so that
you can configure, design, and troubleshoot on a wide variety of networks using
Cisco products.
The book starts out innocently enough, beginning with Part I: Networking Basics, to
give you a refresher course on LAN and WAN protocols and general-purpose
protocol suites. In many cases, I also provide links to web sites to help you locate
additional reading materials. I suggest that you examine Part I in detail, especially
Chapter 6 on advanced IP, even if you feel you already know the subjects covered.
Without a solid understanding of the fundamentals, the advanced concepts are much
harder to grasp.
Part II, Cisco Technology Overview, provides an overview of Cisco networking
technologies, including references to most of the currently available Cisco networking
products. In this section, I provide reference charts with product capabilities and port
densities to help you quickly find the Cisco product you need to support your
requirements, which I hope will save you from hours of looking up datasheets on
Cisco’s web site. Part II culminates with a look at common IOS commands for both
standard IOS and CatOS devices.
Part III, Cisco LAN Switching, covers Cisco LAN-switching technologies. Layers 2
through 4 are covered, including VLAN configuration, STP, MLS, queuing
techniques, and SLB switching. Like all chapters throughout the rest of the book,
these chapters focus first on understanding the basic technology, and second on
understanding that technology as it applies to Cisco devices.
Part IV, Cisco Routing, covers routing on Cisco devices. It begins with a chapter
explaining the benefits and operation of static routing, and progresses through more
and more complex routing scenarios before ending with a chapter on securing Cisco
routers with access lists. All major interior routing protocols are covered, including
RIP, EIGRP, and OSPF.
The appendix contains a complete index of all 540 commands covered in the book,
complete with syntax, descriptions, mode of operation, and page numbers. This
appendix is designed to be your quick reference to IOS commands on nearly any
Cisco device.
Finally, many enhanced diagrams and errata can be found on my personal web site,
at http://www.alfageek.com.
Thanks again, and enjoy!

Download:

http://www.mediafire.com/?miqnqniyyff

Password: www.certhacker.com

Cisco CCNA Most Commonly Used Abbreviations

sanix — Fri, 08 May 2009 23:26:35 +0000

Here are some of the most commonly used abbreviations you should know in CCNA and in common. Just bookmark this page in case you need it again:

*(CSMA/CD) carrier sense multiple access collision detect
*(OUI) organizational unique identifier
*(GBIC) gigabit interface converter
*(DTE) data terminal equipment
*(DCE) data communications equipment
*(NIC) network interface card
*(NOS) network operating system
*(VoIP) voice over IP
*(QoS) quality of service

*(UPS) uninterruptible power supplies
*(DNS) domain name system
*(IDS/IPS) intrusion detection system/intrusion prevention system
*(SSH) secure shell
*(SSL) secure socket layer
*(SNMP) simple network management protocol
*(NTP) network time protocol
*(PDU) protocol data units
*(UDP) user datagram protocol
*(DARPA) defense advanced research projects agency
*(IP) internet protocol
*(NAT) network address translation
*(FTP) file transfer protocol
*(TFTP) trivial file transfer protocol
*(SMTP) simple mail transfer protocol
*(DHCP) dynamic host configuration protocol
*(IANA) internet assigned numbers authority
*(Telnet) terminal emulation
*(SYN) (for synchronize)
*(ISNs) initial sequence numbers
*(ACK) acknowledgment
*(ARP) address resolution protocol
*(MAC)media access control
*(LLC) logical link control
*(SAP) service access points
*(SNAP) subnetwork access protocol
*(RF) radio frequencies
*(IR) infrared
*(ASICs) application-specific integrated circuits
*(VLAN) virtual LANs
*(CRC) cyclic redundancy check
*(CLI) command-line interface
*(POST) power-on self test
*(RPS) redundant power supply
*(STAT) port status
*(UTL) bandwidth utiltzation
*(FDUP) full-duplex
*(MOTD) message of the day
*(VMPS) VLAN membership policy server
*(STP) spanning tree protocol
*(RF) radio frequencies
*(AP) access point
*(CSMA/CA) carrier sense multiple access collision avoidance
*(EIRP) effective isotropic radiated power
*(DSSS) direct sequence spread spectrum
*(OFDM) orthogonal frequency-division multiplexing
*(WEP) wireless equivalency privacy/wireless encryption protocol
*(WPA) wi-fi protected access
*(TKIP) temporal key integrity protocol
*(AES) advanced encryption standard
*(SSID) service set identifier
*(PSK) pre-shared key
*(BSS) badic service set
*(ESS) extended service set
*(CIDR) classless interdomain routing
*(PING) packet inter net groper
*(IEEE) Institute of Electrical and Electronic Engineers
*(SOF) Start of Frame
*(FCS) field or frame checksum sequence
*(BIA) burned-in address
*(EMI) electromagnetic interference
*(CAM) content addressable memory
*(PCS) persunal communications service
*(RTS) ready-to-send
*(CTS) clear-to-send
*(ITU-R) international telecommunication union-radio communication sector
*(MHz) 1 million cycles per second
*(GHz) 1 billion cycles per second
*(ISM) Industrial,Scientific,and Medical
*(UNII) Unlicensed National Information Infrastructure
*(CCK) Complementary Code Keying
*(MIMO) Multiple Input Multiple Output
*(PSK) per-shared keys
*(WEP) wired equivalent privacy
*(CMIC) cisco message integrity check
*(EAP) extensible authentication protocol
*(EAPoL) EAP over LAN
*(RADIUS) Remote Authentication Dial In User Service
*(PPP) point-to-point protocol
*(CHAP) challenge handshake authentication protocol
*(LEAP) Lightweight EAP
*(PEAP) Protected EAP
*(CCMP) CBC-MAC Protocol
*(SOHO) small ofice home ofice
*(IBSS) Independent Basic Service Set
*(BSSID) Basic Service Set Identifier
*(BSA) Basic Service Area
*(ESA) Extended Service Area
*(WZC) wireless zero configuration

Cisco CCNA Video Training – InterVLAN Routing

sanix — Fri, 08 May 2009 03:54:20 +0000

Understanding How InterVLAN Routing Works

Network devices in different VLANs cannot communicate with one another without a router to route traffic between the VLANs. In most network environments, VLANs are associated with individual networks or subnetworks.

For example, in an IP network, each subnetwork is mapped to an individual VLAN. In a Novell IPX network, each VLAN is mapped to an IPX network number. In an AppleTalk network, each VLAN is associated with a cable range and AppleTalk zone name.

Configuring VLANs helps control the size of the broadcast domain and keeps local traffic local. However, when an end station in one VLAN needs to communicate with an end station in another VLAN, interVLAN communication is required. This communication is supported by interVLAN routing. You configure one or more routers to route traffic to the appropriate destination VLAN.

shows a basic interVLAN routing topology. Switch A is in VLAN 10 and Switch B is in VLAN 20. The router has an interface in each VLAN.

Figure 3-1 Basic InterVLAN Routing Topology

When Host A in VLAN 10 needs to communicate with Host B in VLAN 10, it sends a packet addressed to that host. Switch A forwards the packet directly to Host B, without sending it to the router.

When Host A sends a packet to Host C in VLAN 20, Switch A forwards the packet to the router, which receives the traffic on the VLAN 10 interface. The router checks the routing table, determines the correct outgoing interface, and forwards the packet out the VLAN 20 interface to Switch B. Switch B receives the packet and forwards it to Host C.

shows another common scenario, interVLAN routing over a single trunk connection to the router. The switch has ports in multiple VLANs. InterVLAN routing is performed by a Cisco 7505 router connected to the switch through a full-duplex Fast Ethernet trunk link.

Figure 3-2 InterVLAN Routing Over a Single Trunk Link

Multiple subinterfaces are configured on the physical Fast Ethernet router interface, one for each VLAN supported on the trunk. IntraVLAN traffic (traffic with the source and destination host in the same VLAN) is handled entirely by the switch.

InterVLAN traffic is sent across the trunk to the router. The router checks the routing table, determines the outgoing subinterface (destination VLAN), and sends the traffic back over the trunk to the switch, where it is forwarded out the appropriate switch port.

Read more about inter VLAN routing on this Cisco guide.

Download Latest Pass4Sure CCNA 640-802 Dumps v8.03

sanix — Mon, 04 May 2009 13:48:58 +0000

The 640-802 Cisco Certified Network Associate (CCNA) is the composite exam associated with the Cisco Certified Network Associate certification. Candidates can prepare for this exam by taking the Interconnecting Cisco Networking Devices Part 1 (ICND1) v1.0 and the Interconnecting Cisco Networking Devices Part 2 (ICND2) v1.0 courses.
The 640-802 certification exam is your first step into the Hall of CISCO, which is also a must for taking another three CCNA certifications (Security, Voice, Wireless) and the Professional Certification (CCNP, CCDP, CCSP, CCDP, CCIP).

Pass4Sure has recently updated its CCNA exam engine. The problem with the new engine is that it only runs on one computer. So people have created images of the questions included in Pass4Sure CCNA 640-802 exam. The latest version I have found till date is 8.03. If anyone has a newer version, please let me know. You can download Pass4Sure CCNA 640-802 dumps v8.03 here:

Mediafire:

Rapidshare:

Note: This article has been given only for informational and educational purpose. We do not encourage pirated or illegal software. No responsibility of Certhacker team. Use at your own risk.