Devoptimize

Data-Centric Network (Unit 4) Layer 2 Networking STP - Purpose Redundancy in layer 2 switches Loop intervention Better than redundant switch links STP - Loop free Elect root bridge Elect root ports Elected designated ports Elect alternate ports Ethernet Standards MSTI IEEE 802.3ba 40GB Ethernet VS 100GB Ethernet EVB TOR EOR VEB VEPA TRILL FCOE VS FCIP

 Data-Centric Network (Unit 5) IP Services IP Datagram IP Header Version - IPv4 or IPv6 Header Length - Storage of all required headers. Identification - Finding the datagram. Flags - Used under fragmentation. TTL - The time before the packet will be dropped. Protocol Header Checksum - Integrity of the data maintained. Options Padding IP Fragmentation IPv4 Issues No route aggregation - Minimize the routing table complexity. Address space exhaustion Lack of quality of service Limited mobility Security layer issue IPv6 Version number Flow label - Label packet requests handle by routers. Traffic class - Identification and marking class types of packet. Payload length Next header Hop limit Source address Destination address Flow Label  - Maintains  a table with an entry and exit definition for the IPv6 routing. IPv6 VS IPv4 Extension header types Hop by Hop Destination Source Routing Fragmentation Authentication ESP MPLS Link state routing & algorithms OSPF - Link state routing

  Data-Centric Network (Unit 3) Server Architecture Network Attachment - Interface for the communication between server and client via the network. Network Interface Cards - Provide connectivity between hosts. DMA - Transfers data without involving the system processor. Interrupt coalescing - Reduces the number of interrupts hence reducing delay. Jumbo frames - Support bigger ethernet frames. Server Multihoming Fault tolerance - Only one port is active which upon failure would keep it on standby and the other port take up the load. Load balancing - One port receives all the traffic. Link aggregation - A bunch of ports looks like a single link with equivalent bandwidth. PCI & PCI-X Buses - Bandwidth allocation of 533 MBPS & 1.066 GBPS. Client Server Packet Processing - How the OS handles the processing of IP packets. User mode VS Kernel mode - Interrupt handling & system services etc. Ethernet Driver Server TCP/IP Sockets Listen - Length of  receive queue of incoming

  Data-Centric Network (Unit 2) Components of Enterprise Campus Network Private WAN Remote Access Internet server farm Extranet server farm Intranet server farm Data Center Layers Aggregation - Multilayer, switches, firewall & load balancers. Access - Layer 2 connectivity between server farm and server functions. Front End Segment - Protocols (SMTP), Telnet, web servers, etc. Application Segment - Layer 2 connectivity for security policies and firewalls. Backend Segment - Deals with segment storage and connections to database and server. Storage Layer - Server storage and consolidation and communication between them. Transport Layer - Bandwidth, transport protocols like SONET, cabling, and network, etc. Architecture Models Client Server Model N-Tier model Multitier Architecture Data Center Services IP Infrastructure Manual or static routing - Manually configuring the entire routing table. BGP - Inter-domain protocols are run for routing. IGPs OSPF - Intra-domain routing protocols f