Archive for January, 2016

Frame Relay Operation Virtual Circuits

Posted: January 17, 2016 in Cisco
  • Switched virtual circuits (SVC) – Established dynamically by sending signaling messages to the network.
  • Permanent virtual circuits (PVCs) – Preconfigured by the carrier, and after they are set up, only operate in DATA TRANSFER and IDLE modes.
  • VCs are identified by DLCIs. Frame Relay DLCIs have local significance, which means that the values are not unique in the Frame Relay WAN. A DLCI identifies a VC to the equipment at an endpoint.
  • A DLCI has no significance beyond the single link.
    Frame Relay OperationMultiple Virtual Circuits

    Frame Relay Operation Multiple Virtual Circuits

     

Cisco Networking Academy

Posted: January 17, 2016 in Cisco

Mind Wide Open

NAT Terminologies

Posted: January 17, 2016 in Cisco
  • Inside network is the set of devices using private addresses
  • Outside network refers to all other networks
  • NAT includes four types of addresses:
  • Inside local address
  • Inside global address
  • Outside local address
  • Outside global address

NAT TerminologiesNAT Terminologies detail

What is NAT ???

Posted: January 17, 2016 in Cisco
  • NAT is a process used to translate network addresses.
  • NAT’s primary use is to conserve public IPv4 addresses.
  • NAT is usually implemented at border network devices, such as firewalls or routers.
  • NAT allows the networks to use private addresses internally, only translating to public addresses when needed.
  • Devices within the organization can be assigned private addresses and operate with locally unique addresses.
  • When traffic must be sent or received to or from other organizations or the Internet, the border router translates the addresses to a public and globally unique address.

first-hop redundancy protocols

Posted: January 17, 2016 in Cisco

■ Hot Standby Routing Protocol (HSRP)
■ Virtual Router Redundancy Protocol (VRRP)
■ Gateway Load Balancing Protocol (GLBP)

 

HSRP Configuration Lab

HSRP Configuration Lab

first-hop redundancy protocols

first-hop redundancy protocols