Notes on TCP/IP 

DHCP:

know that each subnet needs one scope, 
client reservation needs Ip-address and MAC-address
DHCP provides his clients via broadcast, which normally cannot pass a 
router. A router with DHCP relay agent lets them pass or you install 
a DHCP relay agent on a server in the subnet without DHCP server. He 
captures the broadcast queries and forwards them to the DHCP server. 
Therefore it needs of course the IP-address of the DHCP-server.
2 DHCP servers cannot replicate (WINS can!), therefore, for providing 
backups, you need to divert the range of IP-addresses to the 2 servers.
Exclude IP-addresses assigned to i.e. Unix servers from the IP-range.

SNMP:

a agent software is installed on a PC and sends informations to a 
management system. These 2 need to be on the same community. 
NT only offers agent software.
You can secure the agent by giving it the IP-address (or IPX or
NETBEUI name) and community name of only those servers which can ask the 
agent software. 

WINS:

WIns is needed if you want to browse your  network over routers.
Attention: Wins packets are directed  packets and therefore can 
pass routers. A Wins proxy agent is only needed, if you have 
not-wins-enabled clients in your network.

BROWSING:

Browsing is different from name resolution!!!!!
Browsing means that you can see the shares offered by servers on 
different subnets. This can be reached by WINS or by 
editing the LMHOSTS file. It must contain all PDCs of every subnet. 
BDCs recommended.
It is needed on every client to browse servers on other subnets and 
to log on if the PDC goes down. (to find the BDC).
Also the BDCs and PDCs need entries to find each other for 
replication.

DNS:

Know the cname and MX entries. cache.dns is used for connecting to 
the worldwide internet. 
A cacheonly server is used, when you have slow WAN-links, because 
zone transfer always transferres the whole database.
Know ABSOLUTELY the difference between Netbios name resolution and 
hostname resolution, and when is which used.
The mosts questions were on name resolution.
Know that even in Windows NT Explorer, when you want to connect to a 
server, who's name is longer than 15 chars (i.e. mycomp.alldata.com), 
NT switches automatically to DNS/hosts resolution, because WINS max 
namelength is 15 chars.
Know the syntax in LMHOSTS and HOSTS files and where they reside.
Know the utilities, but without switches.