Transport Layer Responsibilities (26.1.2) The transport layer has many responsibilities. At the transport layer, each set of data flowing between a source application and a destination application is known as a conversation and is tracked separately. It is the responsibility of the transport layer to maintain and track these multiple conversations. As illustrated in Figure…
Default rules – MS AZ-104 Exam Guide
Default rules All NSGs have a set of default rules. You cannot add to, edit, or delete these default rules. However, since they have the lowest possible priority, they can be overridden by other rules you create. The default rules allow and disallow traffic as follows: Table 4-5 shows the default inbound rules for each…
Transport Layer – 100-150 Exam Guide
Objectives Upon completion of this chapter, you will be able to answer the following questions: • What is the purpose of the transport layer in managing the transportation of data in end-to-end communication? • What are the characteristics of TCP? • What are the characteristics of UDP? • How do TCP and UDP use port…
Service tags – MS AZ-104 Exam Guide
Service tags Many Azure services are accessed via internet-facing endpoints. These endpoints can change over time, for example as new Azure regions are built. This makes it difficult to use NSG rules to control access to those services—it’s hard to identify the list of IP ranges to use, and even harder to keep the list…
IP Addressing Services Summary
IP Addressing Services Summary (25.3) The following is a summary of each topic in the chapter and some questions for your reflection. What Did I Learn in this Module? (25.3.1) In data networks, devices are labeled with numeric IP addresses to send and receive data over networks. Domain names were created to convert the numeric…
DHCP Services – 100-150 Exam Guide
DHCP Services (25.2) Dynamic Host Configuration Protocol (25.2.1) The Dynamic Host Configuration Protocol (DHCP) for IPv4 service automates the assignment of IPv4 addresses, subnet masks, gateways, and other IPv4 networking parameters. This is referred to as dynamic addressing. The alternative to dynamic addressing is static addressing. When using static addressing, the network administrator manually enters…
Configure secure access to virtual networks
Skill 4.2: Configure secure access to virtual networks Network security groups (NSGs) control which network flows are permitted into and out of your virtual networks and virtual machines. Each NSG contains lists of inbound and outbound rules, which give you fine-grained control over exactly which network flows are allowed or denied. Combine this with the…
DNS Message Format
DNS Message Format (25.1.3) The DNS server stores different types of resource records that are used to resolve names. These records contain the name, address, and type of record. Some of these record types are as follows: • A – An end device IPv4 address • NS – An authoritative name server • AAAA –…
Troubleshoot network connectivity
Troubleshoot network connectivity Azure provides several built-in tools to troubleshoot network connectivity, with most of them available through Network Watcher. This section focuses on two of the tools within Network Watcher that can help you troubleshoot network connectivity. Connection Troubleshoot Connection Troubleshoot is a Network Watcher feature designed to test the connectivity between an Azure…
IP Addressing Services – 100-150 Exam Guide
Objectives Upon completion of this chapter, you will be able to answer the following questions: • How does DNS operate? • How does DHCP operate? Key Terms This chapter uses the following key terms. You can find the definitions in the Glossary. Domain Name System (DNS) Dynamic Host Configuration Protocol (DHCP) fully-qualified domain names (FQDNs)…