A hostname defined in a CNAME record cannot have any other resource records of other types, like mail exchange (MX) records, TXT records, or A records. There are exceptions for DNSSEC records, like RRSIG and NSEC. A CNAME record can point to another CNAME record, but this is inefficient...
An export target and an import target can be configured with multiple values to implement flexible VPN access control and VPN networking. For example, if the import target of a VPN instance contains 100:1, 200:1, and 300:1, any route with the export target of 100:1, 200:1, or 300...
A user enters a domain name, such as “ibm.com,” into a browser or app and the request is sent to a recursive DNS resolver. Typically, the user's device has predefined DNS settings, provided by the internet service provider (ISP), that determine which recursive resolver a client queries...
Enterprise Networking Service (ENS) Security Services DR and Backup Services Container Services Application Services Database Services EI Services Management Services Enterprise Application Service Glossary What Is Network ACL? Network ACL is a security service for VPCs. It controls access to subnets and ...
What the Cloud is NOT? The cloud is not a fluffy white mass made up of tiny water droplets floating in cyberspace. The cloud is not impacted by weather changes like barometric pressure. The cloud is not a place in a single location. In fact, the cloud can be anywhere. The cloud can ...
A Domain Name System (DNS) record is a set of instructions used to connect domain names with internet protocol (IP) addresses within DNS servers.
(OS), such as Google’s Android and Apple’s iOS. Along with the OS, a smartphone typically has high-speed Internet access and a built-in browser for displaying Web pages. On a smartphone, the Web is accessed by 4G or 3G data networks, Wi-Fi support, mobile broadband, NFC or ...
As described above, it may query the DNS to find the recipient domain's mail exchange (MX) DNS record if necessary. Mail delivery agent (MDA): The MDA receives emails from MTAs and stores them in the recipient's email inbox. What port does SMTP use? In networking, a port is the ...
How is CIDR used in IPv6? IPv6 is a networking addressing system designed to replace IPv4. IPv6 uses a 128-bit unique identifier, which allows it to hold 1,028 times more IP addresses than IPv4. An IPv6 address consists of 8 colon-separated hexadecimal values. IPv6 allows a much large...
8. Repeat step 7 until the correct record is found. 9. The local domain name server saves the returned result to the cache for next use, and returns the result to the client at the same time. Precautions: Recursive query: In this mode, the DNS server receives a client request and must...