1. What DNS record details server IP addresses that are allowed to send Email fo
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Question
1. What DNS record details server IP addresses that are allowed to send Email for a domain?
2. What freeware software can be used to set up a low cost VPN?
3. What internet sites that keep current listing of domains and IP addresses thought to be malicious or dangerous called? list examples.
4. What is the protocol extension to SNMP developed by Cisco which tracks all hardware connections by source, destination, port, and type?
5. Provide a DNS record PAIR that specifies the use of encrypted signatures for a domain’s Email.
6. List the type of DNS server that will automatically refer you to another server if it cannot answer a query.
Explanation / Answer
1. What DNS record details server IP addresses that are allowed to send Email for a domain?
Sender Policy Framework(SPF) record is DNS TXT record this SPF record details the server IP addresses that are allowed to send Email for a domain, the use of SPF record is to detect and prevent un-authorized or spam content from sending mails with forged from addresses on your domain.
2. What freeware software can be used to set up a low cost VPN?
Many Freeware VPN software’s are available in market, with in those
TunnelBear is efficient and secure VPN software to create a secure network connection over a public network such as the internet or a private network of a service provider.
Another VPN Software PIA (Private Internet Access) is best VPN at lowest cost in market. It provides secure privacy options which includes OpenVPN encryption.
3. What internet sites that keep current listing of domains and IP addresses thought to be malicious or dangerous called? List examples.
Corporate websites which maintains bussiness information and E-Commerce websites lists all the Domains and IP addresses which are thought to be malicious or dangerous.
Ex: www.ebay.com,www.avg.com banking sites etc.
4. What is the protocol extension to SNMP developed by Cisco which tracks all hardware connections by source, destination, port, and type?
CCM-MIB extensions allows to track all hardware connections by source, destination, port and type. And the MIB-II provides access to variables that are defined in RFC 1213, such as interfaces, IP, source and destination information supported.
5. Provide a DNS record PAIR that specifies the use of encrypted signatures for a domain’s Email.
DNSKEY this record holds the public key that is used in the DNSSEC authentication process. Which specifies the use of encrypted signatures.
RRSIG digital signatures for a record set are presents in RRSIG records which specifies the use of signatures for a domains Email.
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