Even if the VLAN tag is 4 bytes, the Ethernet frame with VLAN tagging remains 64 bytes. The MTU should not be confused with the minimum datagram size that all hosts must be prepared to accept. Since sensor data are typically time-sensitive, it is important to receive the data at the sink in a timely manner. Several are the researches intended to maintain QoS of communications in IWSNs. Some study adaptive frequency hopping approaches that allow IWSN to switch cognitively working channels for high transmission reliability.
VLAN tags can also be installed in today’s most popular IEEE 802.3 frame format. Within this frame, the “Tag” field uses 4 bytes and is implemented before the length specification. The minimum size of the frame is now increased from 4 bytes to 68 bytes. Tagged frames contain a so-called VLAN tag which of the following goals is not a focus of typical community health promotion efforts? for them to be assigned to a virtuallocalarea network , which separates the network structure into physical and logical levels. This means that with the help of VLANs, subnetworks can be implemented without having to install hardware. The subnetwork is then virtual and not physically realized.
With an ethernet MTU of 1500, this MSS would be 1460 after subtracting 20 bytes for the IPv4 and TCP header. The connected host sends its traffic without any VLAN tag on the frames. When the frame reaches the switch port, the switch will add the VLAN tag.
Likewise, an EtherType of 0x0806 indicates an ARP frame, 0x86DD indicates an IPv6 frame and 0x8100 indicates the presence of an IEEE 802.1Q tag . The Ethernet frame has developed for years, so it has several variants. The first version of Ethernet based on the 16-bit data fields without defined bytes. The modern Ethernet frames were initially used in the Ethernet II before the release of standard IEEE 802.3 in 1983. Because of the extra 4-byte tag, the minimum Ethernet II frame size increases from 64 bytes to 68 bytes, while the maximum Ethernet II frame size now becomes 1522 bytes.
A) It is inserted between the preamble and the destination address. B) It is inserted between the destination and the source addresses. The 802.1Q standard adds this information to the Ethernet header, as shown in the figure below. The IEEE 802.3ac standard increased the maximum Ethernet frame size from 1518 bytes to 1522 bytes to accommodate the four-byte VLAN tag. Some vendors can support jumbo frames up to 64k in some cases.
If we divide 51.2 microsecond in half, we get 25.6 microseconds. This is the amount of time that should be allotted for the journey to the far end of the network. If a collision occurs, the signal will have the remaining 25.6 microseconds to make the return trip.