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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:

11. Cisco unified communication manager 8.6 autoregistration for ephones

CUCM (Cisco unified communication manager) 8.6  is application based (run on isolated Linux OS RedHat)  comprehensive communication platform that support features for high deployment scenario up to 40 000 user per cluster. Further reading about development products from communication manager line can be found on article


12. Examination of VTP modes

VTP as Vlan trunking protocol make management of VLAN database across network simply but is proprietary. VTP allows configure appropriate VLANs on one switch (VTP server) and then propagate these VLANs to whole network (Other VTP server with lover revision number or other VTP clients).

10. Paging

Paging enable to broadcast voice message to ephones. We can look at paging as one-way intercom. Difference between intercom and broadcast is that paging broadcast message to multiple or all phones.

A phone can be assigned only one paging ephone-dn but you can assign paging groups to include multiple ephone-DNs.


Paging can be configured as:

9. Call parking

Call parking enable to place call in "parked" slot using unassigned ephone-DN and then resume the call from any cisco phone. Call park is the same functionality as hold bud call placed on hold can be resumed only from local phone. You can look at parking the call as extension of hold call.

Unused ephone-dn or ephone-DNs must be configured for parking slot.

8. Call Pickup

Enable to answer a remote extension on our local phone. Using PickUp key on ephone and enter extension of ringing phone you can answer phone. If this is undesirable  (any phone can pickup any ringing ephone in company) you must disable directed pickup feature (enabled by default). Entering command 


no service directed-pickup


within telephony-service mode.


Next figure show how to use mentioned command.


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