1.7 Summarize DNS concepts and its components
The most common type of DNS record is a Host record (also
called an A record). In the Internet, a Host record is used
to associate a domain name (FQDN – Fully Qualified Domain Name)
with an IP address.
An MX record stores the IP address of
your SMTP server, so e-mail clients can determine where a message
should be sent. They perform a DNS query against a domain's
MX record to get the IP address of the organization's SMTP server.
An Alias record's job is to associate an alternate name with
a computer for which there is already a Host record. For example,
suppose that the host record for relevant looked like this:
Relevant Host (A) 184.108.40.206
Alias record is like a redirect. For example, you have a
site mydomain.com. However, someone enters www.mysite.com, You
want him or her to be directed to the web.mysite.com. Since
there is no server on the network named "www," set up an Alias
record that associates www with mysite.com. The Alias record
looks something like this:
www Alias (CNAME) mysite.com
MAC address record is not associated with DNS server records
1.8 Given a scenario, implement the following
network troubleshooting methodology
Given below is the sequence of steps recommended to be following
is solving a network problem:
1. Information gathering - Identify symptoms and problems
2. Identify the affected areas of the network
3. Determine if anything has changed
4. Establish the most probable cause
5. Determine if escalation is necessary
6. Create an action plan and solution identifying potential
7. Implement and test the solution
8. Identify the results and affects of the solution
9. Document the solution and the entire process
Indirect enquires are usually not a recommended practice.
1.9 Identify virtual network components
Virtual Switch is a software program that allows one
virtual machine to communicate with another. It can intelligently
direct communication on the network by inspecting packets
before passing them on.
Virtual Server is a server which is shared by multiple
website owners. Each owner can use use and administrate
With virtual desktops, a user's data is stored in a data
center rather than on an office computer's hard drive. By
providing authentication credentials, a secure connection
can be established between the centralized repository of
user data and that user's device , thus allowing the user
to remotely access her document.
PBX A Private Branch Exchange (PBX) is a privately owned
telephone switch traditionally used in corporate telephony
systems. Although a PBX is not typically considered a VoIP
device, it can connect into a VoIP network through a gateway.
In Naas (Network as a Service), the service provider
offers services like e-mail and DNS for use by the clients.
In SaaS (Software as Service), typically access is provided
to a software application.