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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. What Layer does CDP operate at?
14 per network
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Layer 2
Packets

2. EIGRP: What packet is used to propagate routing information?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Segments
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

3. What is the metric for RIP
DCE
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Hop Count

4. Rip Timers: How long is the default for Flush timer.
60
255.255.0.0
IEEE 802.3u
Shortest path first - (SPF)

5. How do you find the magic number for subnetting?
Every 4 ip's
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
62 per network
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

6. Command for a static route with exit interface
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Router(config)#ip route {exit-interface}
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
2 - each port is it's own collision domain

7. Switching Methods: What is Cut-through?
14 per network
Switch forwards the frame as soon as it can
255.255.0.0
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

8. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
14 per network
1 - everything hooked to the hub is in the same collision domain
Layer 2
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

9. EIGRP: What is the range of Autonomous System numbers?
1 - everything hooked to the hub is in the same collision domain
IEEE 802.3
1-65535
180 seconds

10. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
255.255.255.224
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)#
Query and other router responds with a REPLY packet.

11. CABLES: What is the T568A Pinout Standard?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Packets
180 seconds
DCE

12. EIGRP: What is the default administrative distance?
Application
255.255.255.224
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
100

13. RIP: What Algorithm is used in RIP>
Data-Link
Bellman-Ford
Add the magic number to the network minus 1
62 per network

14. Subnetting: What is a 255.255.255.240 in prefix notation
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
14 per network
/28
Every 16 ip's

15. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Network
255.255.255.224

16. What is the layer 2 PDU called?
Frames
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Transport
Every 64 ip's

17. Rip Timers: How long is the default for Invalid timer.
Bandwidth - Delay - reliability and Load
62 per network
180 seconds
/9

18. What is the layer 3 PDU called?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
IEEE 802.3
62 per network
Packets

19. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Presentation
30 per network
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.
1-65535

20. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
62 per network
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
30 per network
100

21. RIP Timers: What is an Holddown Timer?
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
Session
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (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

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

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

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24. Using the magic number how to you figure the broadcast?
Segments
Transport
Add the magic number to the network minus 1
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

25. What is the boot sequence for Cisco Routers?
180 seconds
Network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
2 - each port is it's own collision domain

26. Subnetting: What is a /27 in Decimal
IEEE 802.3ab
Every 16 ip's
255.255.255.224
Hop Count

27. Subnetting: What is a 255.255.252.0 in prefix notation
/22
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
100

28. What is Layer 2 in the OSI Model?
Bellman-Ford
Segments
2 - the bridge separates the collision domain
Data-Link

29. What is Layer 5 in the OSI Model?
IEEE 802.3u
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Transport
Session

30. Rip: how do hold down timers work?
Packets
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
62 per network

31. Subnetting: What is a 255.255.255.0 in prefix notation
Transport
Every 16 ip's
/24
180 seconds

32. What is Layer 1 in the OSI Model?
255.255.255.224
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.
Physical
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

33. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
30 per network
Bellman-Ford
Frames
2 - the bridge separates the collision domain

34. CABLES: What is the T568B Pinout Standard?
Frames
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Packets
14 per network

35. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
60
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
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.
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

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

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37. OSPF: What is the default administrative distance?
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)#
Physical
110
Layer 2

38. OSPF: What does OSPF use for its metric?
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.
Presentation
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
/22

39. What is the Transport PDU called?
/24
Switch forwards the frame as soon as it can
255.255.255.128
Segments

40. IEEE Standards: Ethernet
R3(config)#router rip - R3(config-router)#network 192.168.1.2
IEEE 802.3
2 hosts
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

41. What is Layer 3 in the OSI Model?
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.
IEEE 802.3ab
Network
120

42. Rip: What does v2 have that v1 does not?
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
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Bandwidth - Delay - reliability and Load
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

43. RIP Timers: What is an invalid Timer?
Router(config)#ip route {exit-interface}
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.
Router(config)#ip route {network address} {subnet-mask}
/22

44. Using the magic number how to you figure the network?
126 per network
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Closest multiple of the magic number that is not over the interesting octets number.
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

45. What is the Data-Link PDU called?
D
Add the magic number to the network minus 1
Frames
IEEE 802.3z

46. How many Collision domains are there on a with 1 hub and 2 computers?
1 - everything hooked to the hub is in the same collision domain
14 per network
IEEE 802.3u
Pins 1+2 swap places with pins 3+6

47. Rip: What is the command to enable Ripv2?
Pins 1+2 swap places with pins 3+6
Network
R1(config)#router rip - R1(config-router)#version 2
180 seconds

48. IEEE Standards: Gibabit Ethernet (Fibre)
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Closest multiple of the magic number that is not over the interesting octets number.
IEEE 802.3z
Packets

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

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50. Name the OSI Layers
IEEE 802.3ab
Query and other router responds with a REPLY packet.
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
R3(config)#router rip - R3(config-router)#network 192.168.1.2