1. a) Explain the role of routers, email servers, firewalls, and authentication
ID: 3903433 • Letter: 1
Question
1. a) Explain the role of routers, email servers, firewalls, and authentication servers in addressing the problems associated with DHCP and Network Translation to using network translation in relationship to the analysis of network forensics evidence.
b) Explain the importance of time synchronization for routers, email servers, firewalls, and authentication servers in addressing the problems associated with DHCP and Network Translation to using network translation in relationship to analysis of network forensics evidence
c)
Types of
DNS Zone Records
Description
SOA Record
NS Records
A Records
MX Records
CNAME Records
d) Provide an example of a command line utility that is used to test DNS Resolution.
e) Provide an example of a command line utility that is used to clear the local DNS cache?
Types of
DNS Zone Records
Description
SOA Record
NS Records
A Records
MX Records
CNAME Records
Explanation / Answer
c)Answer:
Types of
DNS Zone Records
Description
SOA Record
A SOA record set is created automatically at the apex of each zone (name = '@'), and is deleted automatically when the zone is deleted. SOA records cannot be created or deleted separately.
You can modify all properties of the SOA record except for the 'host' property, which is pre-configured to refer to the primary name server name provided by Azure DNS.
NS Records
The NS record set at the zone apex (name '@') is created automatically with each DNS zone, and is deleted automatically when the zone is deleted (it cannot be deleted separately).
This record set contains the names of the Azure DNS name servers assigned to the zone. You can add additional name servers to this NS record set, to support co-hosting domains with more than one DNS provider. You can also modify the TTL and metadata for this record set. However, you cannot remove or modify the pre-populated Azure DNS name servers.
Note that this applies only to the NS record set at the zone apex. Other NS record sets in your zone (as used to delegate child zones) can be created, modified and deleted without constraint
A Records
MX Records
CNAME Records
CNAME records
CNAME record sets cannot coexist with other record sets with the same name. For example, you cannot create a CNAME record set with the relative name 'www' and an A record with the relative name 'www' at the same time.
Because the zone apex (name = '@') always contains the NS and SOA record sets that were created when the zone was created, you can't create a CNAME record set at the zone apex.
These constraints arise from the DNS standards and are not limitations of Azure DNS.
Types of
DNS Zone Records
Description
SOA Record
A SOA record set is created automatically at the apex of each zone (name = '@'), and is deleted automatically when the zone is deleted. SOA records cannot be created or deleted separately.
You can modify all properties of the SOA record except for the 'host' property, which is pre-configured to refer to the primary name server name provided by Azure DNS.
NS Records
The NS record set at the zone apex (name '@') is created automatically with each DNS zone, and is deleted automatically when the zone is deleted (it cannot be deleted separately).
This record set contains the names of the Azure DNS name servers assigned to the zone. You can add additional name servers to this NS record set, to support co-hosting domains with more than one DNS provider. You can also modify the TTL and metadata for this record set. However, you cannot remove or modify the pre-populated Azure DNS name servers.
Note that this applies only to the NS record set at the zone apex. Other NS record sets in your zone (as used to delegate child zones) can be created, modified and deleted without constraint
A Records
A Records are the most basic type of DNS recordand are used to point a domain or subdomain to an IP address. Assigning a value to an A record is as simple as providing your DNS management panel with an IP address to where the domain or subdomain should point and a TTLMX Records
A mail exchanger record (MX record) is a type of resourcerecord in the Domain Name System that specifies a mail server responsible for accepting email messages on behalf of a recipient's domain, and a preference value used to prioritize mail delivery if multiple mail servers.CNAME Records
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