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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. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
110
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Data-Link

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

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3. What is Layer 1 in the OSI Model?
/28
Physical
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in 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

4. Subnetting: What is a /25 in Decimal
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.
2 - each port is it's own collision domain
/24
255.255.255.128

5. IEEE Standards: Fast Ethernet
Bellman-Ford
R
IEEE 802.3u
62 per network

6. 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
60
Bellman-Ford
180

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

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8. Name the OSI Layers
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
D
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

9. OSPF: What Algorithm is used?
Shortest path first - (SPF)
/9
IEEE 802.3z
DCE

10. What is the Network PDU called?
Packets
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:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
255.255.0.0

11. CABLES: What is the T568B Pinout Standard?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
/22
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
2 - each port is it's own collision domain

12. CABLES: What is the T568A Pinout Standard?
1-65535
DCE
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Switch forwards frame once it completely receives it

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

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14. IEEE Standards: Gibabit Ethernet (Fibre)
2 - the bridge separates the collision domain
IEEE 802.3z
2 hosts
IEEE 802.3u

15. What are the comands to set the clock rate in a serial connection?
Frames
R1(config)#router rip - R1(config-router)#version 2
2 hosts
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

16. What is the layer 2 PDU called?
Frames
R3(config)#router rip - R3(config-router)#network 192.168.1.2
255.255.255.128
30 per network

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

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18. Using the magic number how to you figure the network?
Closest multiple of the magic number that is not over the interesting octets number.
Data-Link
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Physical

19. EIGRP: What is the hello packet used for?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 128 ip's
Session
IEEE 802.3u

20. Switching Methods: What is Fragment-free?
Every 64 ip's
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.
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
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

21. CABLES: What is the difference between T568A and T568B?
255.255.192.0
DCE
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Pins 1+2 swap places with pins 3+6

22. EIGRP: What is the name of the algorithm used for EIGRP?
Shortest path first - (SPF)
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Data-Link
DUAL: Difusing Update Algorithm

23. What Layer does CDP operate at?
Layer 2
255.255.0.0
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

24. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
IEEE 802.3u
Every 16 ip's
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

25. Command for a static route with exit interface
Router(config)#ip route {exit-interface}
Switch forwards the frame as soon as it can
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)#
Presentation

26. Switching Methods: What is Store and Forward?
Switch forwards frame once it completely receives it
IEEE 802.3ab
Presentation
Bandwidth - Delay - reliability and Load

27. What is the Data-Link PDU called?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
/28
14 per network
Frames

28. What is the layer 3 PDU called?
Packets
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Pins 1+2 swap places with pins 3+6
1 - everything hooked to the hub is in the same collision domain

29. Rip: What causes a triggered update?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Query and other router responds with a REPLY packet.
R1(config)#router rip - R1(config-router)#version 2

30. Symbol for EIGRP on a Show ip route
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Frames
D
180

31. Subnetting: What is a /27 in Decimal
Segments
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
255.255.255.224
Every 64 ip's

32. RIP: What Algorithm is used in RIP>
Periodic Updates of their routing table
255.255.255.252
Bellman-Ford
Every 128 ip's

33. EIGRP: How do you view if there are any successor routes?
110
Every 16 ip's
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Show ip eigrp topology

34. How do you find the magic number for subnetting?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
IEEE 802.3
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

35. What is the Transport PDU called?
Segments
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)#
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

36. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Packets
180
/24

37. Subnetting: What is a 255.255.255.240 in prefix notation
/9
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
/24
/28

38. Subnetting: What is a /18 in Decimal
Transport
Shortest path first - (SPF)
255.255.192.0
Closest multiple of the magic number that is not over the interesting octets number.

39. IEEE Standards: Ethernet
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
IEEE 802.3
100
Packets

40. EIGRP: What is the range of Autonomous System numbers?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Hop Count
Every 32 ip's
1-65535

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

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42. What is Layer 2 in the OSI Model?
60
Show ip eigrp topology
/24
Data-Link

43. Subnetting: What is a 255.128.0.0 in prefix notation
255.255.255.252
/9
60
Every 32 ip's

44. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
Frames
Frames
2 hosts

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

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

47. Symbol for Rip on a Show ip route
R
Switch forwards the frame as soon as it can
IEEE 802.3u
/22

48. Rip: how do hold down timers work?
255.255.0.0
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
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

49. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
/24
100

50. 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
Session
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization