1 In an IPv4 environment, what information is used by the router to forward data packets from one interface of a router to another? **destination network address source network address source MAC address well known port destination address 2 What information is added during encapsulation at OSI Layer 3? source and destination MAC source and destination application protocol source and destination port number **source and destination IP address 3 In a connectionless system, which of the following is correct? The destination is contacted before a packet is sent. **The destination is not contacted before a packet is sent. The destination sends an acknowledgement to the source that indicates the packet was received. The destination sends an acknowledgement to the source that requests the next packet to be sent. 4 Which IP packet field will prevent endless loops? type-of-service identification flags **time-to-live header checksum 5 Which portion of the network layer address does a router use