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How many bits does the DSCP use in the IP header?
how many bit header Ip v4
What happens to the priority of a packet marked with DSCP when it passes a router that only supports IP precedence?
Packets will be prioritized according to IP precedence.
What does 10100000 mean in the ToS byte?
First 6 bits are DSCP bits and the last 2 are ECN bits (ECN = Explicit Congestion Notification) The above answer is right when we look at these bits from Diffserv perspective..... Let me clear what it means interms of Intserv perspective and what are the network models... Basically there are two types of network models...1)Intserv - Integrated services 2)Diffserv-Differentiated Services When the Pkt is in intserv region/domain these 8 bits refers to TOS byte : Type of Service Filed. Here the first 3 field are precedence bits and the next 4 bits are TOS bits and the Last bit is MBZ(Must Be Zero) In the Question above 10100000 : the First 3 PRECEDENCE bits (101) refers to critic/ecp as shown the below table 111 - Network Control 110 - Internetwork Control 101 - CRITIC/ECP 100 - Flash Override 011 - Flash 010 - Immediate 001 - Priority 000 - Routine The Next 4 bits describes following states : Bit 3: 0 = Normal Delay, 1 = Low Delay. Bits 4: 0 = Normal Throughput, 1 = High Throughput. Bits 5: 0 = Normal Reliability, 1 = High Reliability Following is the semantics for the bits 3-6 of the IPv4 TOS octet: 1000 -- minimize delay 0100 -- maximize throughput 0010 -- maximize reliability 0001 -- minimize monetary cost 0000 -- normal service So in the above quest bits 3-6 refers to 0000 which means normal service ..and the last bits as mentioned above is always MBZ. W.r.t Diffserv Domain the interpretation of these fields is already explained in the First answer i.e,. DSCP bits and ECN bits ...
