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Chapter 4 Converged Networks (Borderless, Switched Network (Layers (Access…
Chapter 4 Converged Networks
Borderless, Switched Network
Hierarchical - Facilitates understanding the role of each device at every tier, simplifies deployment, operation, and management, and reduces fault domains at every tier
Modularity - Allows seamless network expansion and integrated service enablement on an on-demand basis
Resiliency - Satisfies user expectations for keeping the network always on
Flexibility - Allows intelligent traffic load sharing by using all network resources
Layers
Distribution
The distribution layer interfaces between the access layer
roviding high availability through redundant distribution layer switches
Providing differentiated services to various classes of service applications at the edge of the network
https://en.wikipedia.org/wiki/Differentiated_services
Aggregating Layer 2 broadcast domains and Layer 3 routing boundaries
Core
The core layer is the network backbone
fault isolation and high-speed backbone connectivity.
Access
represents the network edge, where traffic enters or exits the campus
Access layer switches connect to distribution layer switches
more efficient and secure with intellegence
Switches
Modular Configuration Switches
Stackable Configuration Switches
Fixed Configuration Switches
The particular model determines the features and options available.
Switching types
cut-through switching
rapid frame forwarding
can make a forwarding decision as soon as it has looked up the destination MAC address (14 bytes)
does not drop most invalid frames.
fragment free.
waits for the collision window (64 bytes) to pass before forwarding the frame.
The lower latency speed of cut-through switching makes it more appropriate for extremely demanding, high-performance computing (HPC) applications that require process-to-process latencies of 10 microseconds or less.
If there is a high error rate (invalid frames) in the network, cut-through switching can have a negative impact on bandwidth; thus, clogging up bandwidth with damaged and invalid frames.
Store and forward
received the entire frame and checked the frame for errors
Store-and-forward switching is Cisco’s primary LAN switching method.
Collision Domain
Autonegoation of Duplex and speed
Broadcast Domain
