Computer Science 881
                            Quiz 5             Name_______________________


1. After a successful fib lookup what route type indicates that
   a packet must be forwarded to another host:

   a. RTN_LOCAL                     b. RTN_UNICAST

   c. RTN_REMOTE                    d. All of the above

2. After a successful fib lookup what route type indicates that
   a packet is destined for THIS host:

   a. RTN_LOCAL                     b. RTN_UNICAST

   c. RTN_REMOTE                    d. All of the above

3. How does the operation of fib_validate_source() differ when
   receive packet filtering is on / off on a given interface?

   on -




   off -



4. In IP reassemble a single instance struct ipq represents

   a. a single fragment              b. a single packet being
                                        reassembled

   c. all packets presently
      being resassembled.


5. Distinguish between the use of the  "meat" and "len" variables
   in reassembly


   meat -



   len  -


6. While frags are <<being reassembled>> they are linked via the

    a. skb->next pointer           b. the shinfo(skb)->fraglist

    c. the first one in the chain  d. the first one in the chain
       uses fraglist and the          uses fraglist and the others
       others use next.               use next.


7. After a successful reassembly << completes >> the frags are linked
   as follows:

    a. skb->next pointer           b. the shinfo(skb)->fraglist

    c. the first one in the chain  d. the first one in the chain
       uses fraglist and the          uses fraglist and the others
       others use next.               use next.


9. When a fragement is received and its head-end overlaps the tail-end
   of a single fragment that has already been received

   a. the overlapped tail of the      b. the overlapping head of the
      existing fragment is               new fragment is discarded
      discarded

   c. the ENTIRE existing overlapped  d. the entire new fragment is
      fragment is discarded.             discarded

10. When a packet is to be delivered to multiple raw sockets and
    to multiple transport protocols (e.g. multiple tcpdumps are
    running)

    a. delivery to all raw sockets    b. delivery to all transports
       occurs first                      occurs first

    c. delivery to the first raw      d. delivery to all but the last
       socket precedes the transports    raw socket precedes the transports
       and the remaining raw sockets     and the last raw socket follows
       follow the transports             the transports

11. When a unicast packet reaches the udp_rcv() function, it will
    ultimately be delivered to:

    a. exactly one sk structure       b. zero or one sk structures

    b. one or more sk structures      d. zero or more sk structures


12. For delivery to a UDP socket suppose that sk->daddr is specifed
    but the source address of the incoming packet is not the same as
    sk->daddr. This guarantees that:

    a. The value of score can't reach   b. The packet cannot be delivered
       4 but the packet may still be       to sk.
       delivered to the sk if no other
       sk has a score of 3 or better.

    c. Assuming this "sk" and several
       others have a score of 3 the packet
       will be delivered to all of them.

13. The relation between arp neighbour structures and route cache entries
    is

    a. one to one                     b. one to many

    c. many to one