Identifying Network Layer Protocols with the Ethernet Type Field While the Ethernet header’s address fields play an important and more obvious role in Ethernet LANs, the Ethernet Type field plays a much less obvious role. The Ethernet Type field, or EtherType, sits in the Ethernet data-link layer header, but its purpose is to directly help […]

Multicast Configurations and Verifications You can configure separate ranges of addresses in the PIM or PIM6 domain using the multicast distribution modes described in Table 1-22. Table 1-22 PIM and PIM6 Multicast Distribution Modes Tables 1-23 through 1-25 describe the most-used multicast configuration commands. For the full list of commands, refer to the Nexus Multicast Routing Configuration […]

Creating Key Pairs You will now learn to create a new key pair that can be used for an instance. Not creating these key pairs can hinder your ability to connect to your EC2 instances, especially if those instances are not running Systems Manager Agent, as you will see later in this chapter in the […]

SageMaker Feature Store Imagine you are building a recommendation system. In the absence of Feature Store, you’d navigate a landscape of manual feature engineering, scattered feature storage, and constant vigilance for consistency. Feature management in an ML pipeline is challenging due to the dispersed nature of feature engineering, involving various teams and tools. Collaboration issues […]

ExamAlert The AWS Well-Architected Framework is a big topic. Although you don’t need to be an expert on this topic for the exam, having a basic understanding of the pillars and their purpose will help you with some difficult questions on the exam. Both the Operational Excellence and Performance Efficiency pillars rely on monitoring resources, […]

PIM Designated Routers/Forwarders In PIM Bidir mode, the software chooses a designated forwarder (DF) at RP discovery time from the routers on each network segment. The DF is responsible for forwarding multicast data for specified groups on that segment. The DF is elected based on the best metric from the network segment to the RP. […]

Ethernet Addressing The entire idea of sending data to a destination unicast MAC address works well, but it works only if all the unicast MAC addresses are unique. If two NICs tried to use the same MAC address, there could be confusion. (The problem would be like the confusion caused to the postal service if […]

Optimizing Dynamic Routing BGP route selection may not always be the optimal path to the destination as the protocol does not take into consideration latency, congestion, or jitter. As a result, your traffic may be routed over a suboptimal path. The path that BGP chooses may need to be overwritten with a better path. Path […]

Caution You should not configure both Auto-RP and BSR protocols in the same network. Auto-RP: Auto-RP is a Cisco protocol that was used prior to the Internet standard bootstrap router mechanism. You configure Auto-RP by selecting candidate mapping agents and RPs. Candidate RPs send their supported group range in RP-Announce messages to the Cisco RP-Announce […]

Ethernet Data-Link Protocols One of the most significant strengths of the Ethernet family of protocols is that these protocols use the same data-link standard. In fact, the core parts of the data-link standard date back to the original Ethernet standards. The Ethernet data-link protocol defines the Ethernet frame: an Ethernet header at the front, the […]