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Static IP vs Dynamic IP Posted in: CCNA 200-301, IP Services, Network Fundamentals - Every device on an IP network needs an address. You can assign that address by hand, or let a server hand it out automatically. Static IP addressing means you configure an address by hand and it stays fixed, while Dynamic IP addressing uses the Dynamic Host Configuration Protocol (DHCP) to lease addresses to clients automatically… ... Continue Reading
Multigroup HSRP (MHSRP) Load Sharing Posted in: CCIE Enterprise Infrastructure, IP Services - Multigroup HSRP (MHSRP) is a form of gateway redundancy that lets two or more HSRP groups run on the same interface, with each router active for a different group. By doing this, both gateway routers on one subnet will forward traffic at the same time, instead of having one router idle in standby. Within each… ... Continue Reading
HSRP Object Tracking IP SLA Posted in: CCIE Enterprise Infrastructure, CCNP ENCOR 350-401, IP Services - HSRP Object Tracking IP SLA monitors end-to-end reachability by actively probing an upstream host and automatically adjusting HSRP router priority when those probes fail. Unlike interface tracking, which only monitors whether a local interface's line protocol is up, IP SLA can detect failures anywhere along the path to the probe destination, including a remote router… ... Continue Reading
Automatic Private IP Addressing (APIPA) Posted in: CCNA 200-301, IP Services, Network Fundamentals - Automatic Private IP Addressing (APIPA) is a fallback mechanism that lets a Windows host assign itself an IP address from the 169.254.0.0/16 range when it's configured as a DHCP client, but no DHCP server responds. The host uses a 255.255.0.0 subnet mask and gets no default gateway, so it can only talk to other hosts… ... Continue Reading
IP Address Classes: A, B, C, D and E Explained Posted in: CCNA 200-301, Network Fundamentals, Subnetting - IP (Internet Protocol) address classes divide the 32-bit IPv4 (Internet Protocol version 4) address space into five categories, A through E, based on the first bits of the first octet, as originally defined in RFC 791. This classful scheme fixes the boundary between the network and host portions of an address, and ties each class… ... Continue Reading