TCP Flow Control—Window Size and Acknowledgments (26.6.5) TCP also provides mechanisms for flow control. Flow control is the amount of data that the destination can receive and process reliably. Flow control helps maintain the reliability of TCP transmission by adjusting the rate of data flow between source and destination for a given session. To accomplish…
Reliability and Flow Control
Reliability and Flow Control (26.6) Reliability and flow control are two of the main features of TCP, not present in UDP. TCP Reliability—Guaranteed and Ordered Delivery (26.6.1) The reason that TCP is the better protocol for some applications is that, unlike UDP, it resends dropped packets and numbers packets to indicate their proper order before…
Create and delegate a DNS Zone to Azure DNS
Create and delegate a DNS Zone to Azure DNS A DNS zone is a resource in Azure DNS. Creating a DNS zone resource allocates authorita- tive DNS name servers to host the DNS records for that zone. Azure DNS can then be used to manage those DNS records. DNS queries directed to those DNS name…
TCP Connection Establishment
TCP Connection Establishment (26.5.2) In some cultures, when two persons meet, they often greet each other by shaking hands. Both parties understand the act of shaking hands as a signal for a friendly greeting. Connections on the network are similar. In TCP connections, the host client establishes the connection with the server using the three-way…
DNS services in Azure – MS AZ-104 Exam Guide
DNS services in Azure There are several DNS-related services and features in Azure. An overview of each is given in the following list. The first three items are Azure services, which you consume by creat- ing service-specific resources that you will be billed for. The remaining three items are Azure features, which you configure using…
How DNS Works – MS AZ-104 Exam Guide
How DNS WorksTo properly understand the various DNS services and features available in Azure, it is first necessary to understand how the domain name system works. In particular, it is important to understand the different roles played by recursive and authoritative DNS servers, and how a DNS query is routed to the correct DNS name…
Port Number Groups – 100-150 Exam Guide
Port Number Groups (26.4.3) The Internet Assigned Numbers Authority (IANA) is the standards organization responsible for assigning various addressing standards, including the 16-bit port numbers. The 16 bits used to identify the source and destination port numbers provides a range of ports from 0 through 65535. The IANA has divided the range of numbers into…
Configure name resolution and load balancing
Skill 4.3: Configure name resolution and load balancing Humans work with names, but computers prefer IP addresses. Fundamentally, DNS is about mapping names to IP addresses, making name-based rather than IP-based networking possible. Simplifying somewhat, a client makes a DNS query containing a domain name and receives a response containing the IP address for that…
Configure private endpoints for Azure services
Configure private endpoints for Azure servicesPrivate endpoints take the concept of service endpoints one step further. In the same scenario of a VM in subnet0 trying to communicate with a storage account, in addition to using a pri- vate IP address as the source IP address, the destination IP address will also be private. Private…
Configure service endpoints for Azure services
Configure service endpoints for Azure servicesBy default in Azure, PaaS services are accessible using a public endpoint that resolves to a public IP address. When a VM in a subnet accesses this service, for example a storage account, the network and routing from the VM translates the source IP to the IP of the VNet…