ITN 154 CH 5

Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved? (Choose two.)

Destination and source MAC addresses have local significance and change every time a frame goes from one LAN to another. Destination IP addresses in a packet header remain constant along the entire path to a target host. 5.1.4 MAC and IP

What are two features of ARP? (Choose two.)

If a host is ready to send a packet to a local destination device and it has the IP address but not the MAC address of the destination, it generates an ARP broadcast. If a device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply. 5.2.1 ARP

A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in its ARP cache. How will the device obtain a destination MAC address?

It will send an ARP request for the MAC address of the default gateway. 5.2.1 ARP

What is the Layer 2 multicast MAC address that corresponds to the Layer 3 IPv4 multicast address 224.139.34.56?

The multicast MAC address is a special value that begins with 01-00-5E in hexadecimal. The value ends by converting the lower 23 bits of the IP multicast group address into the remaining 6 hexadecimal characters of the Ethernet address. The remaining bit in the MAC address is always a "0". In this case: 224 (decimal) => 01-00-5E 139 (decimal) = 10001011 (binary) ==> (23 bits) = 0001011 (binary) = 0B (hexadecimal) 34 (decimal) = 00100010 (binary) = 22 (hexadecimal) 56 (decimal) = 00111000 (binary) = 38 (hexadecimal) Putting all together: 01:00:5E:0B:22:38 5.1.3 Ethernet MAC