Working on our practical networking lessons our students and I, as their teacher, we are usually configuring several routers and switches (sometimes up to ten), which are accessible remotely. For this, we welcome the use of multi-tabbed and especially multi…

My students received the message „You did not complete all requirements“ even though they are set to „Pass“. It is an Netacad issue. The instructor can resolve this by manually refreshing the Course Details in the following way: Going to…

This example shows how to generate 254 loop interfaces with assigned ipv4 addresses 172.16.0.1/24 up to 172.16.255.1/24. The code is: enable tclsh for {set i 0} {$i < 256} {incr i} { ios_config „int loop $i“ „ip address 172.16.$i.1 255.255.255.0″…

Working with my HP Terminal server, which we are using as a remote console acccess solution allows us login into Cisco router console ports remotely, i’m loosing the Putty connection due to inactivity. However the PuTTY client can be configured to…

Teaching CCNP ROUTE courses and describing the problematic of two-way routing redistribution I need an example describing the case which point out to the process of creating a routing loop. This example shows how such routing loop may arise using…

Once if we are allowed download zipped version of ccna curriculum (for example as an netacad instructor) we should be able run them locally without web server need. However there is a problem to display these curriculums by default as…

In our Cisco NetAcad classes we had utilized built in Windows telnet client (of course we have putty instead), which was available in each system till Windows XP by default. In windows 7 the telnet client is not available by…

We investigate a special topology condition, where a switch is connected itself on ports Faa0/1 and Fa0/2, and one of the port has BPDUFilter feature applied (i.e. simulating STP is switched off). Both ports are in the same vlan (vlan…

http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/ht_rawip.html Cisco switches provides SPAN and RSPAN feature which is suitable for monitoring and capturing packets flowing through switch ports or VLANs. But this feature is not provided on Cisco routers, therefore if you look for it there is not…

There is some confusion and misunderstanding regarding VTP (VLAN Trunking Protocol)+DTP (Dynamic Trunking Protocol) and this article will hopefully make it all clear. Most of the confusion comes from the statement that VTP is always a security threat to your…