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Minimum bytes in IPv4 header?
Minimal bytes required in IPv4 header are 20 i.e. 20 bytes are mandatory. And total bytes in IPv4 header are 60.
What is The header of an IPv4 packet does not include fields required for?
The header of an IP packet does not include fields required for reliable data delivery. There are no acknowledgments of packet delivery. There is no error control for data.
Which fields of the IPv4 header change from router to router and why they change?
IP address remains the same. Mac address changes from router to router.
Contrast the IPv4 and the IPv6 header fields?
Simplified header format. IPv6 has a fixed length header, which does not include most of the options an IPv4 header can include. Even though the IPv6 header contains two 128 bit addresses (source and destination IP address) the whole header has a fixed length of 40 bytes only. This allows for faster processing. Options are dealt with in extension headers, which are only inserted after the IPv6 header if needed. So for instance if a packet needs to be fragmented, the fragmentation header is inserted after the IPv6 header. The basic set of extension headers is defined in RFC 2460.
Which IPv4 header field is responsible for defining the priority of the packet?
differentiated services
What is The header of an IPv4?
Header is always a multiple of 4bytes and so we can have a maximum length of the field as 15, so maximum size of the header is 60 bytes out of which 20 bytes are mandatory.
How much overhead would this be if IPv6 is tunnelled over IPv4?
When tunneling IPv6 over IPv4, the overhead primarily consists of the additional IPv4 header and any encapsulation overhead. An IPv4 header is typically 20 bytes, while an IPv6 header is 40 bytes. Thus, the total overhead for tunneling one IPv6 packet over IPv4 would be 20 bytes, resulting in a total packet size increase of 20 bytes for every IPv6 packet transmitted. This additional overhead may impact performance, especially in networks with high traffic or limited bandwidth.
The fields in TCP header that are missing from UDP header?
The sequence number, acknowledge number, and Window fields.
The source IP address for an IPv4 datagram is stored where in the header?
4th longword (bytes 13-16)
How can dns distinguish between ipv4 and ipv6 host in determining which resource record to return?
It reads the protocol/bit stream/header
The Protocol field used in IPV4 header is not present in the fixed IPV6 header Why not?
The Protocol field in the IPv4 header, which specifies the transport layer protocol used (like TCP or UDP), is not present in the fixed IPv6 header because IPv6 uses a more flexible approach with extension headers. Instead of a single Protocol field, IPv6 allows for multiple extension headers to be used, which can carry information about the transport protocol and other features. This design improves efficiency and scalability, enabling better handling of various protocols and options without cluttering the main header.
How many address in IPv4 address?
32 bits in a IPv4 address
