WIN310W6

Last we talked about was root, cash.dns is the root file,


Type of name server, name server is a dns server, FQDN.

Hello.uk are primary, primary zone on the primary server, is the athorratative zone, only 1 primary dns, but can add as many secondary dns, different physical machine, used for backup, load balancing, save bandwidth and connection time. You can promote the secondary to the primary.

Master name serer, responsible to send updates to secondary, can be primary or a secondary, zone transfers from primary to secondary, SOA has a time time limit, and the primary is also responsible to update the second, these are replicas of the main DNS server, Now who is the master of 2 and 3 it’s the primary, there is flexibility here, 2 can be the master of 3, 3 does not have to know 1 but knows 2, 3 will query 2 for updates while 2 is getting updates from 1. OH YEAH SO 1 to 2 to 3 is 15 minutes, if this occurs every 15 minutes the 2 waits 15 then 3 waits 30,

Caching does not have a database, everytime it resolves something it caches it and resolves it for a specific time, u use it so after u don’t need to maintain and the other for quick resolution, SOA start of authority,

AD every single machine is a cheef, makes it so you can go to every location and do administration, and add a record, the record will be replicated on the other directory servers, every single DNS has control over the zone, how would they know which is the latest up date there is a counter, as the other dns respond they look at the version number and the remainder will be sent which is the updates of the server,

Resource Record, what type can we put in the DNS, pg 74, the ownerm it identifies the resources record and who it belong to, name domain the host, this I s basically the owner, there is TTL time to live the life to it, class Internet class, type of record what we doing mapping name to ip address, mail server to a server,m several types of records we can input, cantains resource data, something with the record that is associated with 32 binary, which is the ip address.

SOA – start of authority, original point of domain or zone, the information in the SOA it shows the authoritative server, this is the server hosting the particular zone of domain, you can create as many as you want to, this is is the guy that will be responsible for everything’s, serial number….every time you manage or update the dns is increases by one so because it haws increased u have to give the updates to the other zones. This is the negotiating item.
DNS PORT 53 UDP FOR THE QUERY
53 TCP FOR THE UPDATE

Name server, DNS server responsible for the zone,
A record is a recourse record, the purpose for the A record is the mapping of the assosiacted IP address. 32 integer. \

PTR – point of record, record of a reverse look up. We say what is the ip address of venus what is the name of the ip, its called venus the planet.ca, we need when we have applications have th resovle the name through ip…..from ip address we grab the name

CNAME or an Alias – mapping of a conanical name to an established name \
Like when we go to Seneca cs = cs.senecac.on.ca

Another example- an ftp server, and the name was, ftp, ftp1.banana.ca it can change to ftp2.banana.ca but when every one is conneting they are connecting by ftp, what they are saying is to make an alias, and redirect it

MX = Mail Exchange pg 77 bottom, is in fact is the server that is willing to host your mail, you can have

10 ns1.mail.yahoo.com
20 “”””””””””
50 “””””””””””

This is the priority in which to send the mail.

SV – service locator pg 79, allow to specify server to application, an example is Active Directory, that relies on the server record, and Also
NetLogon Service, this service carries info from the desktop to the server. For example your user name password and domain name.

Two types of queries, Iterative and Recursive

What is a query, it comes form a resolver or the client looking for some assistan what does he want, please tell me the ip address of this particular host,

Iterative, gives you a refferall, the client is looking for sales.contoso.com, he goes to the dns serer, and the dns server gives him an answer to go the .com or root servers, the client himself goes to the other servers gets the answers where contoso is goes to contoso for a name of sales which is sitting within the domain, and obviously gets the ip address for sales.contoso.com, the client has done the work, who cached the information the client.

Recursive, the priouviously the client have done everything, now the the client submits the query to the local dns, asking him what the ip address of sales.contoso.com, and the client waits for the DNS to do all the chasing.

WINS and DNS are in the same business, they both so resolutions, name resolutions, dns sports car, WINS truck, DNS FULL qualified domain name, DNS does FQDN, WINS NetBios, NetBios are computer names, computer23 or 24, wins is faster, but it only works on Microsoft networks. How do they work?
‘
In the dns point it to WINS..

Look what happens a client wants to do DNS. WINS handles 15 chars, the nature of it.

DNS creates a WINS, DNS will truncate the domain name and leave the ACCOUNTING name, dns gets is from wins, then dns puts back the family name into the Microsoft.com

Four types of response you get from the query,

Positive this is the ip address, an example can be something from the cache,

Authritative main server primary server or secondary server

Referral – Iterative nd Recursive
Negative – Answer it don’t exist

PG 87

Zone Transfer – Notify –

AXFR – FULL – launch a secondary DNS
IXFR = Incremental –

Fires a queryin the soa and looks for a response, tcp

Iterative load on client
Recursive load on some other machine

Conditional forwarding you can add more stuff in it, 2 companies for faster resolution to the specific company……microsoft.123.123.321.333