To pass the BSCI exam, you will need to be aware of the gap between IRDP and HSRP. While they have the exact purpose, setup and the functionality of each are different.
The purpose of both is to enable hosts to rapidly find a standby router once the primary router fails. IRDP is employed Unix variants and by Windows DHCP clients, but it is seen by you in Cisco routers. IRDP is described in RFC 1256. More info https://www.openbookexam.org/
IRDP routers will probably multicast Hi messages which host apparatus hear. When a host hears from over 1 IRDP router, then in the event the primary goes down, it is going to select one and will begin using the router.
HSRP is a Cisco-proprietary protocol that’s created for quick cutover into a secondary router when the primary fails, however, the server devices do not”watch” either the secondary or primary router. A router is used by the hosts . This router has its own IP and MAC address! All the time, the router is the one. The router takes over with no disruption to services, When the router goes down.
The HSRP routers communicate with multicasting upgrades to 220.127.116.11, and its own through these hellos the HSRP routers determine which router is primary and which is secondary. HSRP is described in RFC 2281.
The setup of all these can be dealt with in a future tutorial. I recommend you to read the RFCs discussed in this guide, to read about the settings and options available for each these protocols.
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