This #HSRP lab requires just a few lines of configuration, using defaults for pretty much every option. Check here for the original lab, and check your answers in this post below the fold.
Figure 1: HSRP Design, One LAN Switch
Figure 2: HSRP Design, Two LAN Switches
Answers
Example 3: R1 Config
interface GigabitEthernet0/1 standby 10 ip 192.168.100.1
Example 4: R2 Config
interface GigabitEthernet0/1 standby 10 ip 192.168.100.1
Commentary
Hot Standby Router Protocol (HSRP) is a Cisco proprietary First Hop Redundancy Protocol (FHRP) that enables hosts to have redundant gateways. This is important because many LANs are configured with a single gateway that is used by all devices; if this single gateway were to fail, then all of the devices are left without access to external networks (not on the local LAN).
With HSRP, multiple routers reference a single IP address to be used as the default gateway. One router actively provides the data plane function of receiving packets from hosts, while the other waits to take over if the first router fails.
In this example, both R1 and R2 would be configured with a HSRP virtual IP address of 192.168.100.1. Note that the instructions said to use the lowest available IP address; R1 and R2 use two high values in the subnet, so with no other information available, it appears that 192.168.100.1 is available. Both routers must use the same HSRP group number in order to cooperate to create the same HSRP group, so both routers use the command standby 10 ip 192.168.100.1.
Note that HSRP routers choose the router with the highest interface address as the HSRP active router, unless one router is configured with a higher HSRP priority than than the other router. In this case, with neither router configured with an standby priorirty interface subcommand, both routers use a default priority of 100, therefore relying on the tiebreaker. The tiebreaker is to pick the router with the highest interface IP address; R2 wins in this case, meeting the requirement that R2 be the active router under normal conditions. This means that all of the traffic coming from PC1 will go through R2 unless there is a failure. Note that if you configured on R2 a command like standby 10 priority 101 (or any value greater than 100), I would count it as correct.