What is sharepoint server doing

I have a sharepoint environment where there are two sharepoint front end servers.

number 1 seems to be the more important one.  when I reboot that one, sharepoint goes down.
number 2 is another front end.

I am taking over an environment from a guy who is gone.

is there an easy way to figure out which front end server is handling what?
its 2013.
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Jamie McAllister MVPSharePoint ConsultantCommented:
I would have a look at your load balancer and see how it's configured. It should be sending traffic to both WFE, presumably as a Round Robin.

Re-booting one WFE shouldn't mean you totally lose SP unless the traffic is all being routed to that one in error.

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jamesmetcalf74Author Commented:
load balancer....
would this be built-into the sharepoint server... or is this controlled by networking?

so you are thinking that since I have two, that they both have an environment that should support the full sharepoint experience?
jamesmetcalf74Author Commented:
I know for a fact that one is not being relied on at the time for redundancy because all of sharepoint goes down when number 1 server is rebooted.  This could be the network setup I assume.
is there away in the interfaces of number 1 and 2 sp servers to see if sharepoint was configured for failover?
jamesmetcalf74Author Commented:
jpeg of environment
Jamie McAllister MVPSharePoint ConsultantCommented:
I can't answer detailed questions about NLB, as it's not my specialism, but a beginners guide to checking the config etc is here. You can check on the relevant servers;

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