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17. Port security on access layer switchport

Port security is feature that enable permit or deny traffic for end user PCs connected to access layer switch. Port security enable specify a group of valid MAC address on port. If maximum secure MAC address  is reached then security violation modes lead to protect, restrict or shutdown of port.


There are 3 ways how to configure port security:

1) Static secure MAC addresses - manually configured with

   switchport port-security mac-address MAC_ADDRESS

16. Administrative Distance and route source preference

In environment with 2 or more enabled routing protocols must be present mechanism for selection of routing sources that are learned. What routing protocol obtained routes for remote network will be introduced to routers routing table? That is a big question.


Administrative Distance in short AD is considered parameter that will break the tie and say about trustworthiness of routing source.



15. PPP and Frame relay in small network

PPP and Frame relay are protocols operating at data link layer used in segment of private WAN connection. PPP enable establish communication through serial link between cisco and noncisco device where can not be used proprietary HDLC cisco encapsulation. Frame relay networks offer packet switched technology in providers network.  This article will focus on simple implementation of PPP serial link and Frame relay link in office environment.



UNIX and posix like OS administration

This section focus on Unix or posix like OS administration. Articles cover area of basic CLI commands with appropriate explanation, deployment of application layer services as FTP, SFTP, WWW, E-mail, NFS, SAMBA file server or LDAP, SSH access an certification key generation.

16. CUCM 8 - Call hunt configuration

As it was in CUCME call hunt enable one hunt pilot number to distribute calls to members of hunt list. For reference please read our article


CUCM configuration for call hunt is more flexible and robust. During creation of hunt environment we going through this steps:

7. Call Transfer

Call transfer is process of moving an active phone call from one phone number to another. 

This process can be invoked by pressing Trnsfer softkey and dialing the number where we wish to forward call. 

Before we can transfer a call we must consider some aspects of call transfer.


1) There are 3 transfer options that can be configured under telephony-service at CME router

6. Call Forwarding

Call forward is a voice productivity feature that can to direct all of your calls to different ephone.

There are 2 different types of call forward:


1) Dynamic call forwarding - forward calls on the cisco phone itself.

To forward call you can press CFwdAll softkey on ephone, enter the phone number you want forward a calls to and press End softkey or # button. This step by step process show next pictures.

5. Hybrid phone system for helpdesk environment

This training environment will introduce network helpdesk office. 3 ephones are configured with unique numbers but also with overlay button and third button is used for overlay line extension (x button). Each ephone can in future answer a call incoming from PSTN (call of clients calling to helpdesk).

11. Examination of traditonal inter VLAN routing with dedicated routers

Our training lab will focus on "academic" traditional inter VLAN communication. This routed connection uses two separate dedicated routers that are connected through two point fast ethernet speed connection (link). Our goal will be to understand how will data packet travel from one VLAN (red) to second VLAN (Green) using blue routed segment.


Network topology looks like this



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