Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
DNS Records and Messages
Two types of records are used DNS. The question records are used in the question section of the query and response messages. The resource records are used in the answer authoritative and additional information sections of the response message.
Question Record: A questions records in used by the client to get information from a server. This contains the domain name.
Resource Record: Each domain name is associated with a record called the resource record. The server database consists or resource returned by the server to the client.
A resource records is a quadruple that contains the following fields.
Name , Value , Type , TTL
TTL is the time to live of the resource records. It determines when a resource should be removed from a cache form a cache. In the example records given below we ignore the TTL field.
The meaning of name and value depend on type:
If a DNS server is authoritative for a particular host name then the DNS server will contain a type a record for the hostname. If a server is not authoritative for a hostname then the server will contain a type NS record for the domain that includes the hostname. It will also contain a Type a record that provides the IP address of the DNS server in the value field of the NS records. As an example suppose an edu TLD server is not authoritative for the host gain cs un mass edu. Then this server will contains a record for a domain that includes the host cs mass. Edu. For example ( umass edu dns unmass. Edu NS) the du TLD server would also contain a Type a record which maps the DNS. Server dns umass.edu to an IP address for example ( dns umass edu 128.119.111A)
a transperent switch is inserted between two local area networks ABC and XYZ.network ABC has workstation 1,2,and 3 and Network XYZ has workstation 4,5, and 6. show the contents of
Can you describe the concept of Collision domain?
What is Stop-and-Wait Protocol? In Stop and wait protocol, sender sends single frame, waits unless it receives confirmation from the receiver (okay to go ahead), and then sends
The program must be well documented which includes meaningful variable and subroutine names ("self documenting code") along with comments in the code. The following block of code w
Process to send data is called as encapsulation and process to receive data is called De-encapsulation.
Define Retransmission? Retransmission is a process in which the receiver detects the occurrence of an error and asks the sender to resend the message. Resending is repeated unt
In a network that contains two servers and twenty workstations, where is the best place to install an Anti-virus program? An anti-virus program must be installed on all servers
What is Star topology Each station is directly connected to a common central node. Typically, each station attaches to a central node via two point-to-point links, one for tran
What is DUAL in EIGRP?
QUESTION 1: (a) Define what you understand by the following terms in Network Flows: i) UnDirected Path ii) Directed Path iii) Directed Cycle. iv) Tree In each of the abov
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd