ccna pdf in hindi

ccna pdf in hindi. Accelerated Forwarding (EF): RFC 3246 defines EF as the DSCP decimal value 46 (binary 101110). The first 3 bits (101) map directly to the Layer 2 CoS value used for voice traffic.5. At Layer 3. Cisco recommends using EF to mark voice packets only.Assured Forwarding (AF): RFC2597 defines AF as the use of 5 DSCP high valid bits to indicate queue and discard priority. The first 3 high valid bits are used to specify the class. Class 4 is the best queue and class 1 is the worst queue. The 4th and 5th high valid bits are used to specify the discard priority. The 6th high valid bit is set to zero. The AF,* formula explains how the AF value is calculated, DSCP value = xX8+*X2. For example, if af32 belongs to class 3 (binary 011) and has medium discard priority (binary 10), the DSCP value is 28, i.e. 3X8+2X2=28.Class Selector (CS): since the first 3 high valid bits of the DSCP field represent classes, these bits are also referred to as Class Selector (CS) bits. These 3 bits map directly to the CoS field and the 3 bits of the IP priority field to maintain compatibility with IEEE 802..422.Cisco Networking Lab CCNA Lab Guide (Release 2) Table 21.4 DSCP DefinitionDSCP value Meaning DSCP value Meaning000000 Default (BE) 010010 af2I (AF)001000 csl (CS) 010100 af22 (AF)010000 cs2 (CS) 010110 af23 (AF)011000 cs3 (CS) 011010 af31 (AF)100000 cs4 (CS) 011100 af32 (AF)