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What is the purpose of time to live field within a packet header?
Wiki User
∙ 12y ago
There may sometimes be a problem, usually temporary, that data is sent back and forth, or goes around in a loop, due to some routing error. If this happens, the data will eventually be discarded. Every time a packet is re-sent, the TTL is reduced by one; when it goes down to zero, the packet "dies".
Wiki User
∙ 14y ago
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Which IPv4 header field is responsible for defining the priority of the packet?
differentiated services
What IPv6 header field is used to identify the upper layer protocol or optional extension headers that are appended to the end of an IPv6 packet?
next header
Which field in the IP packet header allows checking for data transmission errors?
time to live
How are endless loops of packets prevented?
A packet will not go around networks endlessly because it has a field in the header called the TTL field. This is a number that limits the number of hops or networks a packet will be forwarded to.
What does the protocol field in the IP header identify?
The protocol field, in the IP header, identifies what kind of data is in the IP packet - the upper-layer protocol. For example, if the code is 6, that means that the data is a TCP segment.
Why does the TCP header have a header length field and UDP header does not?
in tcp header (32 bits) we have a field that is called options and padding that has variable in length and the header length shows the actual header size i.e size of 20 octets+size of options and padding field and in UDP we dont have any field like that and its header is fixed of 8 OCTETS (32 bits header size) refrence: WIRELESS COMMUNICATIONS AND NETWORKS by William Stallings Second Edition pg 91(see fig)
What is the TTL - Time to Live and Why is it required?
TTL is a value in data packet of Internet Protocol. It communicates to the network router whether or not the packet should be in the network for too long or discarded. Usually, data packets might not be transmitted to their intended destination within a stipulated period of time. The TTL value is set by a system default value which is an 8-bit binary digit field in the header of the packet. The purpose of TTL is, it would specify certain time limit in seconds, for transmitting the packet header. When the time is exhausted, the packet would be discarded. Each router receives the subtracts count, when the packet is discarded, and when it becomes zero, the router detects the discarded packets and sends a message, Internet Control Message Protocol message back to the originating host.
Which field are contained within an IEEE Ethernet frame header?
1)Source and destination MAC Address 2)FCS Field
When a tunnel mode is used a new outer ip header is constructed for both ipv4 and ipv6 indicate the relationship of each outer ip header field and each extension header in the outer packet to the corr?
i naw the answer but you dont answer my guestinq first my giestion i want to ask what is mean by outer plantes
What was used for error detection in ATM networks?
CRC is used for this purpose. The control field is HEC (header error control).
What is the purpose of the TTL field within an IP packet header?
clears an unreachable route from the routing table after the invalid timer expires prevents regular update messages from inappropriately reinstating a route that may have gone bad removes an unreachable route from the routing table after the flush timer expires limits the period of time or number of hops a packet can traverse through the network before it should be discarded used to mark the route as unreachable in a routing update that is sent to other routers
What is a service provided by the Flow Label field of the IPv6 header?
This 20-bit field provides a special service for real-time applications. It can be used to inform routers and switches to maintain the same path for the packet flow so that packets are not reordered.
