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Cisco CCNP Certification / BCMSN Examination Tutorial: Writing QoS Coverage

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QoS – High quality of Service – is a large matter on each the BCMSN examination and real-world networks. QoS is so huge right now that Cisco’s created separate specialist certifications that cowl nothing however QoS! It may be an amazing matter at first, however grasp the basics and also you’re in your option to examination and job success.When you work with QoS at any degree – and eventually, you’ll – you have to know methods to write and apply QoS insurance policies.Creating and making use of such a coverage is a three-step course of.1. Create a QoS class to establish the visitors that will probably be affected by the coverage.2. Create a QoS coverage containing the actions to be taken by visitors recognized by the category.

three. Apply the coverage to the suitable interfaces.If the phrase “identify the traffic” feels like it is time to write an access-list, you are proper! Writing an ACL is one in every of two methods to categorise visitors, and is the extra frequent of the 2. Earlier than we get to the less-common methodology, let’s check out methods to use an ACL to categorise visitors.You need to use both a normal or prolonged ACL with QoS insurance policies. The ACL will probably be written individually, after which known as from the category map.SW1(config)#access-list 105 allow tcp any any eq 80SW1(config)#class-map WEBTRAFFICSW1(config-cmap)#match access-group 105Now that we have recognized the visitors to be affected by the coverage, we higher get round to writing the coverage! QoS insurance policies are configured with the policy-map command, and every clause of the coverage will include an motion to be taken to visitors matching that clause.SW1(config)#policy-map LIMIT_WEBTRAFFIC_BANDWIDTHSW1(config-pmap)#class WEBTRAFFICSW1(config-pmap-c)#police 5000000 exceed-action dropSW1(config-pmap-c)#exitThis is an easy coverage, nevertheless it illustrates the logic of QoS insurance policies. The coverage map LIMIT_WEBTRAFFIC_BANDWIDTH calls the map-class WEBTRAFFIC. We already know that every one WWW visitors will match that map class, so any WWW visitors that exceeds the said bandwidth limitation will probably be dropped.

Lastly, apply the coverage to the suitable interface.SW1(config-if)#service-policy LIMIT_WEBTRAFFIC_BANDWIDTH inGetting your CCNP is an effective way to spice up your profession, and studying QoS is an incredible addition to your talent set. Like I mentioned, be taught the basics, do not get overwhelmed by taking a look at QoS as a complete, and also you’re in your option to success!

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