Cisco certifications

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official root page https://www.cisco.com/c/en/us/training-events/training-certifications.html#~stickynav=1

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new devnet panel: 4 levels

• associate
• specialist
• professional
• export

https://www.cisco.com/c/en/us/training-events/training-certifications/certifications/devnet.html

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According to the FAQ, passing exams is not the only way to maintain certification. You can also take online lessions to recertify.

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exam preparation https://developer.cisco.com/

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devnet associate exams

• DEVASC 200-901: https://learningnetwork.cisco.com/community/certifications/devnet-associate/devasc/exam-topics

devnet professsional exams

• CORE(300-901) :https://learningnetwork.cisco.com/community/certifications/devnet-professional/devcor/exam-topics
• IOT (300-915): https://learningnetwork.cisco.com/community/certifications/devnet-professional/deviot/exam-topics
• DEVOP (300-910): https://learningnetwork.cisco.com/community/certifications/devnet-professional/devops/exam-topics

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routing and switching in Chinese https://tw.iqiyi.com/v_19rro73s78.html

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• DSCP(6-bit) is defined in diffserv
• IP precedence(3-bit) is in ToS

mapping table

read through rfc2475 to really understand QoS.

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match-all vs match-any

• a class-map has multiple match entries.
• a policy-map has multiple class-action pairs.
• a physical interface can have an input service-policy and an output service-policy

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GNS3 firmware images