By Silvano Da Ros
A finished creation to the speculation and functional purposes of content material networking• Get a robust creation to the elemental networking suggestions precious for content material networking, together with community deal with translation, IP multicast content material supply, caliber of provider, and streaming media• grasp the application-layer protocols, together with HTTP, SSL, RSTP, RTP and FTP• layout redundancy and excessive availability through the use of server load balancing, area identify process (DNS) listing prone, Cisco DistributedDirector software program, proximity-based load balancing, and international sticky databases• learn how to swap and offload encrypted content material by way of uploading, developing, and configuring certificate and keys in safe Sockets Layer (SSL) termination units• learn how you can configure routers with net Cache communique Protocol (WCCP) and to modify content material requests to content material engines for serving usually asked items• tips on how to configure caching, dwell push- and pull-splitting, content material acquisitioning, and pre-positioning utilizing Cisco software and content material Networking method (ACNS) softwareContent networking is the most well-liked expertise used to augment community and alertness functionality. the expansion of content material networking has been pushed via end-user calls for for richer content material and reduced reaction instances. those calls for have triggered the sector of content material networking to flourish with technological advances. this day many businesses use content material networking so as to add a layer of intelligence to their platforms, scaling server availability and optimizing content material supply.
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The concepts of disaster recovery in GSLB follow the same basic principle as used by the US DoD but at Layers 57 of the OSI model. • Response times for content or DNS requests or both from clients in geographically dispersed locations cause perceived performance degradation. In the same manner that content edge delivery resolves response time issues by placing content closer to the clients, GSLB places the data centers themselves in closer proximity to clients. • The capacity of the current data center location has reached its bandwidth or physical limits and cannot handle an increase in load.
Note Because most Internet hosts and servers support ICMP, it is useful for calculating round trip times (RTT) between two devices. ICMP RTT is discussed in Chapter 12,"Exploring Global Server Load Balancing," for proximity determination in GSLB. The IP header contains a Time To Live (TTL) field that is set by the sender to the maximum number of routers (or hops) that a packet will encounter on the way to its final destination. An intermediary router will 58 Part II: Networking Fundamentals Part II: Networking Fundamentals 59 send an ICMP "TTL exceeded" error message to the sender that indicates that the TTL has been reached and will drop the offending packet.
For example, the Cisco PIX firewall uses a proprietary stateful failover mechanism for the standby firewall to know when to take over processing for the active firewall. Technically, you also can use FWLB to manage availability, but in most cases Cisco recommends using its proprietary mechanism for Cisco PIX failover. Furthermore, scaling the Cisco PIX firewalls by upgrading to a higher series firewall is often less costly in terms of financial investment in the hardware and resources required to manage the design.