Monthly Archives: March 2016


1. What is the process through which a new header is added to the data as it passes down each OSI layer called?

Question 1 of 50

2. What is the mechanism through which the data is reliably transferred using TCP?

Question 2 of 50

3. Which debug command returns this output?




Question 3 of 50

4. What needs to be configured on R1 to have this output?




Question 4 of 50

5. Which statements are true based on the output shown below?




Question 5 of 50

6. You connect to a router using the console port and see this: "R2# ". What is this mode called?

Question 6 of 50

7. You have telnetted to a router and started a few debug commands. However, there is nothing shown on the screen. What do you need to do to see the debugging messages on the screen?

Question 7 of 50

8. You have configured the router using this configuration-register value. What will happen after a reboot of the router?




Question 8 of 50

9. What are the main functions that a switch performs?

Question 9 of 50

10. What results from each VLAN having its own subnet address?

Question 10 of 50

11. Considering the below output, what is the correct configuration of gi1/0/2?




Question 11 of 50

12. What are the benefits of using VTP?

Question 12 of 50

13. What are the benefits of using VTP pruning?

Question 13 of 50

14. What is the best summary route for these routes:,, and

Question 14 of 50

15. Which of the below versions of the IPv6 address 2001:0000:0000:12A0:0000:5678:af23:bcdd is not correct?

Question 15 of 50

16. What are some of the techniques that allow migration from IPv4 to IPv6?

Question 16 of 50

17. Which of the following are typical ICMPv6 messages?

Question 17 of 50

18. What is the command that produces this output?




Question 18 of 50

19. A router has to send a packet to, and it has in its routing table the following routes:,,, and What route will be used to forward the packet?

Question 19 of 50

20. Considering the below diagram and output, what is the command to add a static route on R1 toward the route 2001:1:2:3::/64?




Question 20 of 50

21. Which OSPF timer needs to be the same for the OSPF adjacency to come up?

Question 21 of 50

22. In OSPF, the size of router-id is 32 bit. What is the size of the router-id field in OSPFv3?

Question 22 of 50

23. Other than assigning an IP address, what are the two mandatory parameters that need to be assigned through DHCP?

Question 23 of 50

24. You want to apply ACL 1 on the Telnet lines. What is the correct command to achieve this?




Question 24 of 50

25. What is the command to allow OSPF traffic in an ACL?

Question 25 of 50

26. What type of NAT maps a private to a public address on a one-to-one basis?

Question 26 of 50

27. Which of the following criteria is not part of the STP election algorithm?

Question 27 of 50

28. What are the RSTP link types?

Question 28 of 50

29. You see the below messages in the logs. What is the reason for these messages, and what is the consequence?


%SPANTREE-2-BLOCK_BPDUGUARD: Received BPDU on port GigabitEthernet0/1 with BPDU Guard enabled. Disabling port.
%PM-4-ERR_DISABLE: bpduguard error detected on 0/1, putting 0/1 in err-disable state

Question 29 of 50

30. To what RSTP port state has the STP Listening port state been converted to?

Question 30 of 50

31. Considering that LACP is used to configure a Port-Channel interface, when will the EtherChannel not come up?

Question 31 of 50

32. Which of the following is not a PAgP mode?

Question 32 of 50

33. Which of the following is not a step in the router boot-up sequence?

Question 33 of 50

34. What are the purposes of using DR and BDR routers?

Question 34 of 50

35. What is the correct order of the state through which two routers has to go before an adjacency is established?

Question 35 of 50

36. Which of the following is not an OSPF area type?

Question 36 of 50

37. What command is needed to disaply the EIGRP neighbors?

Question 37 of 50

38. Which of the following is not an EIGRP packet type?

Question 38 of 50

39. An operator decides to apply the below configuration. What are consequences of this action?




Question 39 of 50

40. What is the IP address to which the VRRP Hello packets are sent?

Question 40 of 50

41. What are the load-balancing algorithms used by GLBP?

Question 41 of 50

42. What are some of the reasons for which SNMP is used?

Question 42 of 50

43. Considering that the router needs to be configured for NAT, what command needs to be applied on the Serial interface?




Question 43 of 50

44. What are the messages exchanged in a CHAP authentication?

Question 44 of 50

45. Which of the following are Frame Relay encapsulations?

Question 45 of 50

46. What are the protocols through which external authentication is possible?

Question 46 of 50

47. What are the advantages of using the switch port’s port security feature?

Question 47 of 50

48. The following definition belongs to which RSTP port role: "Alternative path to the root bridge but different from the root port path"?

Question 48 of 50

49. You have the following output. What does "INACTIVE" mean?




Question 49 of 50

50. What are some reasons that RSTP improves STP convergence?

Question 50 of 50