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

2. What is the boot sequence for Cisco Routers?
Every 16 ip's
Segments
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

3. Symbol for EIGRP on a Show ip route
62 per network
D
IEEE 802.3u
Every 128 ip's

4. What is the layer 2 PDU called?
Frames
30 per network
Segments
60

5. Subnetting: What is a 255.128.0.0 in prefix notation
14 per network
R3(config)#router rip - R3(config-router)#network 192.168.1.2
/9
1-65535

6. Subnetting: where do the networks break with a /25

7. Subnetting: What is a 255.255.255.240 in prefix notation
Switch forwards the frame as soon as it can
IEEE 802.3u
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)#
/28

8. What is Layer 1 in the OSI Model?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
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
Bandwidth - Delay - reliability and Load
Physical

9. Using the magic number how to you figure the network?
R1(config)#router rip - R1(config-router)#version 2
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Closest multiple of the magic number that is not over the interesting octets number.
Physical

10. Switching Methods: What is Store and Forward?
126 per network
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Switch forwards frame once it completely receives it
62 per network

11. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3u
IEEE 802.3z
IEEE 802.3ab
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

12. Rip: What does v2 have that v1 does not?
Switch forwards frame once it completely receives it
Segments
2 - the bridge separates the collision domain
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

13. Subnetting: What is a /27 in Decimal
Every 16 ip's
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
255.255.255.224
Every 32 ip's

14. Subnetting: What is a /30 in Decimal
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
255.255.255.252
255.255.255.128
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

15. What is the Data-Link PDU called?
Frames
DCE
Closest multiple of the magic number that is not over the interesting octets number.
Every 32 ip's

16. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Network
/28
IEEE 802.3z

17. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Packets
Layer 2
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
62 per network

18. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
DUAL: Difusing Update Algorithm
Bandwidth - Delay - reliability and Load
14 per network
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

19. Subnetting: What is a 255.255.252.0 in prefix notation
Query and other router responds with a REPLY packet.
Layer 2
Presentation
/22

20. Subnetting: where do the networks break with a /27

21. Using the magic number how to you figure the broadcast?
/24
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Add the magic number to the network minus 1
255.255.255.128

22. Rip Timers: How long is the default for Flush timer.
60
Every 128 ip's
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
2 - the bridge separates the collision domain

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

24. Rip Timers: How long is the default for Invalid timer.
/9
14 per network
/22
180 seconds

25. What Layer does CDP operate at?
2 hosts
Every 128 ip's
Layer 2
30 per network

26. How many Collision domains are there on a with 1 hub and 2 computers?
Segments
IEEE 802.3
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
1 - everything hooked to the hub is in the same collision domain

27. CABLES: What is the T568A Pinout Standard?
This timer stabilizes routing information and helps prevent routing loops during periods when the topology is converging on new information. Once a route is marked as unreachable - it must stay in holddown long enough for all routers in the topology
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Session
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

28. OSPF: What Algorithm is used?
IEEE 802.3
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Every 128 ip's
Shortest path first - (SPF)

29. How do you find the magic number for subnetting?
Show ip eigrp topology
/28
Every 4 ip's
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

30. CABLES: What is the T568B Pinout Standard?
Pins 1+2 swap places with pins 3+6
Every 64 ip's
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Add the magic number to the network minus 1

31. Subnetting: What is a 255.255.255.0 in prefix notation
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Query and other router responds with a REPLY packet.
/24
Packets

32. What are the commands to setup SSH?
255.255.255.128
Physical
Presentation
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)#

33. What is the layer 4 PDU called?
255.255.255.224
60
Layer 2
Segments

34. Symbol for Rip on a Show ip route
14 per network
Presentation
60
R

35. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
180
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
100
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

36. EIGRP: What is the default administrative distance?
Pins 1+2 swap places with pins 3+6
100
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
120

37. RIP: What is the default Administrative Distance?
Add the magic number to the network minus 1
120
Closest multiple of the magic number that is not over the interesting octets number.
30 per network

38. RIP: What Algorithm is used in RIP>
Bellman-Ford
Network
Add the magic number to the network minus 1
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

39. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
180 seconds
Add the magic number to the network minus 1
Switch forwards the frame as soon as it can
30 per network

40. Rip: What is the command to enable Ripv2?
Presentation
/28
R1(config)#router rip - R1(config-router)#version 2
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

41. Switching Methods: What is Cut-through?
30 per network
Every 128 ip's
IEEE 802.3z
Switch forwards the frame as soon as it can

42. Rip Timers: How long is the default for Holddown timer.
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Frames
180

43. What gets the clock rate - DCE or DTE?
By default - the flush timer is set for 240 seconds - which is 60 seconds longer than the invalid timer. When the flush timer expires - the route is removed from the routing table.
/28
Hop Count
DCE

44. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
Add the magic number to the network minus 1
DCE
2 hosts
Every 128 ip's

45. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Shortest path first - (SPF)
R3(config)#router rip - R3(config-router)#network 192.168.1.2
IEEE 802.3ab
255.255.255.224

46. What is Layer 7 in the OSI Model?
Application
Every 128 ip's
Closest multiple of the magic number that is not over the interesting octets number.
255.255.192.0

47. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Segments
Query and other router responds with a REPLY packet.
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

48. RIP Timers: What is an Flush Timer?
By default - the flush timer is set for 240 seconds - which is 60 seconds longer than the invalid timer. When the flush timer expires - the route is removed from the routing table.
110
Show ip eigrp topology
Packets

49. What are the comands to set the clock rate in a serial connection?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
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

50. What is Layer 2 in the OSI Model?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Transport
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Data-Link