Test your basic knowledge |

CCENT

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. How do you find the magic number for subnetting?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
2 - the bridge separates the collision domain
Hop Count

2. What is Layer 2 in the OSI Model?
30 per network
Switch forwards the frame as soon as it can
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Data-Link

3. How many Collision domains are there on a with 1 switch 2 computers?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

4. EIGRP: What is the default administrative distance?
30 per network
Frames
100
Network

5. Subnetting: where do the networks break with a /30

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

6. What is Layer 4 in the OSI Model?
R3(config)#router rip - R3(config-router)#network 192.168.1.2
/28
Transport
Shortest path first - (SPF)

7. What is the layer 3 PDU called?
Packets
1 - everything hooked to the hub is in the same collision domain
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 32 ip's

8. What is the layer 2 PDU called?
Switch forwards frame once it completely receives it
Frames
255.255.0.0
R1(config)#router rip - R1(config-router)#version 2

9. Rip: What is the command to enable Ripv2?
Shortest path first - (SPF)
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
R1(config)#router rip - R1(config-router)#version 2
110

10. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Transport
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
IEEE 802.3ab
It adds the cost of each jump - R1 to R2 over a t1 is a cost of 64 - R2 to computer is a cost of 1. Total cost of route is 65

11. What is the boot sequence for Cisco Routers?
Show ip eigrp topology
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
2 - each port is it's own collision domain

12. EIGRP: What is the hello packet used for?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
120
Switch forwards frame once it completely receives it

13. What is Layer 6 in the OSI Model?
Bandwidth - Delay - reliability and Load
Presentation
Layer 2
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

14. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
110
1 - everything hooked to the hub is in the same collision domain
255.255.255.224
2 hosts

15. What is Layer 7 in the OSI Model?
255.255.255.252
14 per network
Show ip eigrp topology
Application

16. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
2 - the bridge separates the collision domain
Network
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
62 per network

17. RIP: What is the default Administrative Distance?
120
255.255.255.224
Add the magic number to the network minus 1
Presentation

18. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Bandwidth - Delay - reliability and Load
1 - everything hooked to the hub is in the same collision domain

19. Subnetting: What is a 255.255.255.240 in prefix notation
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
R1(config)#router rip - R1(config-router)#version 2
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
/28

20. OSPF: What does OSPF use for its metric?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
100
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Segments

21. Symbol for Rip on a Show ip route
R
R1(config)#router rip - R1(config-router)#version 2
Router(config)#ip route {network address} {subnet-mask}
14 per network

22. Subnetting: What is a /16 in Decimal
255.255.0.0
Packets
/24
30 per network

23. Subnetting: where do the networks break with a /26

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

24. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Network
Presentation
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
2 - the bridge separates the collision domain

25. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
Layer 2
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Show ip eigrp topology

26. Subnetting: What is a 255.255.255.0 in prefix notation
DCE
Packets
/24
255.255.0.0

27. Rip: What does v2 have that v1 does not?
DCE
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Router(config)#hostname R1 - R1(config)#line VTY 0 4 - R1(config-line)#login local - R1(config-line)#transport input telnet ssh - R1(config-line)#exit - R1(config)#username {user} password {pass} - R1(config)#ip domain-name {domainname} - R1(config)#
Every 16 ip's

28. What is the metric for RIP
IEEE 802.3
Hop Count
Segments
255.255.192.0

29. Switching Methods: What is Store and Forward?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Application
Switch forwards frame once it completely receives it
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

30. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
D
/24

31. Subnetting: where do the networks break with a /28

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

32. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
Frames
1-65535
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

33. What are the comands to set the clock rate in a serial connection?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Pins 1+2 swap places with pins 3+6
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Hop Count

34. Rip Timers: How long is the default for Flush timer.
60
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Add the magic number to the network minus 1
Hop Count

35. What Layer does CDP operate at?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Layer 2
1 - everything hooked to the hub is in the same collision domain
Every 16 ip's

36. Rip Timers: How long is the default for Invalid timer.
180 seconds
1. Router receives update from neighbor indicating a route down - Router makes route as down and starts holddown timer - If router gets an update indicating route is back holddown is removed - If an update is received indicating route is down again i
Router(config)#ip route {exit-interface}
110

37. Command for a static route with 'Next Hop' Address
255.255.192.0
Router(config)#ip route {network address} {subnet-mask}
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
126 per network

38. IEEE Standards: Fast Ethernet
255.255.192.0
Switch forwards frame once it completely receives it
IEEE 802.3u
Show ip eigrp topology

39. Subnetting: where do the networks break with a /29

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

40. Name the TCP/IP Layers
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Every 4 ip's
Frames
IEEE 802.3u

41. What is the layer 4 PDU called?
Query and other router responds with a REPLY packet.
Layer 2
Segments
Packets

42. RIP Timers: What is an invalid Timer?
F an update has not been received to refresh an existing route after 180 seconds (the default) - the route is marked as invalid by setting the metric to 16. The route is retained in the routing table until the flush timer expires.
DUAL: Difusing Update Algorithm
IEEE 802.3ab
Packets

43. What is Layer 3 in the OSI Model?
Shortest path first - (SPF)
Network
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

44. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
14 per network
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Every 128 ip's
IEEE 802.3u

45. EIGRP: What packet is used to propagate routing information?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
/9

46. OSPF: What Algorithm is used?
/22
Shortest path first - (SPF)
Layer 2
Every 8 ip's

47. How many Collision domains are there on a with 1 hub and 2 computers?
Frames
1 - everything hooked to the hub is in the same collision domain
It adds the cost of each jump - R1 to R2 over a t1 is a cost of 64 - R2 to computer is a cost of 1. Total cost of route is 65
Segments

48. CABLES: What is the T568B Pinout Standard?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Frames
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

49. What gets the clock rate - DCE or DTE?
180
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
DCE
Every 128 ip's

50. EIGRP: How do you view if there are any successor routes?
IEEE 802.3
Show ip eigrp topology
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
255.255.192.0