DeVry University -North Brunswick, N.J. NCM 428_Y Enterprise Networking with TCP/IP Test # 3 // 10.11.06

DeVry University
-
North Brunswick, N.J.


NCM 428_Y Enterprise Networking with TCP/IP


Test # 3 // 10.11.06



NAME: (Print) ________________________________Section: Y



1.


W
hat is the difference between a “message digest” and a “hash”?





2.


If you can find 2 messages having the same hash you have caused a
-------




3.


What is the advantage of signing the hash of a long message over signing


the message directly?










4.


If the hash output of the SHA
-
1 hash function were totally random the


number of zeros in it would be
-----------
.










5.


Two characteristics of any strong hash function are:

[Be very clear!]










6. The “O” in OSPF stands for OPEN. What does that mean?
------------------
.





7. LSAs type 3 are used for 2 purposes, these are:


a.


b.




8. A
totally

stubby

network is charecterised by the f
ollowing:














9. How can a router in an OSPF domain declare itself as a candidate to the BDR


position?







10. The DR (OSPF domain) functions as follows:


a.



b.




11. In O
SPF context, neighbors that achieve adjacency are allowed to
-------








12. A router within area that is
not

the core is known as “
--------------
router”




13. OSPF LSA type 5 are flooded throughout the
-------------------------------
-------
.






14. External networks are advertised inside an OSPF domain as type2 by default.


What does that mean?











15. In cofiguring an OSPF
–
speaking router one way to specify the



router’s ID is to use the highest configured IP address. What happens if this


interface goes down?











16. EIGRP supports the deployment of VLSM. Break the IP address 200.200.128.0/17


into two /2
1 addresses, four /26 addresses, and six /30 addresses [30 points].























17. EIGRP has a very fast convergence rate due to several factors, 4 of them are:


a)



b)



c)




d)



18. What is the implication (EIGRP) if t
he cost via a feasible successor candidate is less


than the feasible distance?














19. EIGRP is Cisco’s answer to
----------------------------------------------
protocol.






20. Auto summary

is on by default in EIGRP
------------------------------------
T/F.









21. In EIGRP context, the “feasible successor” refers to
-----------











22. The metric values for all interfaces in Figure [Q
-
22], are:


Router

Interface

BW(k)

DLY(usec)

A

E0

10000

1000


F0

100000

100


T0

16000

630


S0

512

20000


S1

1544

20000

B

T0

16000

630


S0

1544

20000

C

E0

10000

1000


S0

1544

20000

D

E0

10000

1000


F0

100000

100


S0

1544

20000

E

E0

10000

1000


S0

1544

2
0000

F

F0

100000

100


S0

512

20000


E1

10000

1000

G

E0

10000

1000


E1

10000

1000


F0

100000

100


S0

1544

20000

Assuming EIGRP environment:
you MUST show your work FULLY otherwise
you get No credit!!!!



{20 points}*


What is the cost for a packet

at router D to reach subnet #20 via router G?
























23. An entry in a routing table starts with the designation


“D” which indicates that this very route has been installed due to


-----------------
-------

advertisement.






24. The “ip summary
-
address….” command in EIGRP is applied under an


interface. The purpose of this command is as follows: