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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?
Frames
Layer 2
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

2. How many Collision domains are there on a with 1 hub and 2 computers?
180 seconds
1 - everything hooked to the hub is in the same collision domain
Periodic Updates of their routing table
255.255.255.128

3. EIGRP: What packet is used to propagate routing information?
/9
255.255.0.0
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Bellman-Ford

4. What is the Data-Link PDU called?
255.255.0.0
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Every 128 ip's
Frames

5. IEEE Standards: Fast Ethernet
/28
IEEE 802.3u
Closest multiple of the magic number that is not over the interesting octets number.
30 per network

6. Rip: What does v2 have that v1 does not?
Router(config)#ip route {exit-interface}
255.255.255.252
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

7. OSPF: What Algorithm is used?
Every 128 ip's
Shortest path first - (SPF)
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Query and other router responds with a REPLY packet.

8. CABLES: What is the difference between T568A and T568B?
Segments
Pins 1+2 swap places with pins 3+6
Bandwidth - Delay - reliability and Load
60

9. Subnetting: What is a 255.255.255.0 in prefix notation
/24
62 per network
255.255.0.0
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

10. 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
R
100

11. Subnetting: What is a 255.255.255.240 in prefix notation
Network
/28
255.255.0.0
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

12. How do you find the magic number for subnetting?
Data-Link
/22
DCE
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

13. Switching Methods: What is Cut-through?
180 seconds
Every 4 ip's
Every 8 ip's
Switch forwards the frame as soon as it can

14. What is the layer 3 PDU called?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Packets
30 per network
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

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

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16. Rip: Command to prevent rip updates on an interface
Show ip eigrp topology
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
/28
Segments

17. 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
Packets
Pins 1+2 swap places with pins 3+6
Every 16 ip's

18. OSPF: What does OSPF use for its metric?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
IEEE 802.3
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

19. RIP: What is the default Administrative Distance?
255.255.255.252
120
Frames
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

20. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
/24
180 seconds
255.255.255.128

21. Command for a static route with exit interface
Router(config)#ip route {exit-interface}
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
255.255.192.0
D

22. What is Layer 3 in the OSI Model?
Application
IEEE 802.3ab
Network
DUAL: Difusing Update Algorithm

23. Symbol for EIGRP on a Show ip route
Data-Link
D
255.255.255.252
Bellman-Ford

24. Rip Timers: How long is the default for Invalid timer.
255.255.255.128
IEEE 802.3u
R
180 seconds

25. Subnetting: What is a 255.128.0.0 in prefix notation
255.255.192.0
/9
Packets
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

26. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
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
Every 16 ip's

27. What gets the clock rate - DCE or DTE?
255.255.255.224
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
DCE
DUAL: Difusing Update Algorithm

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

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29. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
Packets
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
120
2 hosts

30. Subnetting: What is a /30 in Decimal
Switch forwards frame once it completely receives it
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Every 32 ip's
255.255.255.252

31. RIP Timers: What is an invalid Timer?
/24
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)#
180 seconds
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.

32. Switching Methods: What is Fragment-free?
Application
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
110
Transport

33. RIP Timers: What is an Flush Timer?
D
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
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.

34. What is the layer 4 PDU called?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Pins 1+2 swap places with pins 3+6
Segments
Show ip eigrp topology

35. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Frames
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
Add the magic number to the network minus 1
IEEE 802.3u

36. What is Layer 2 in the OSI Model?
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
Data-Link
/28

37. What is the metric for RIP
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. 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
Switch forwards frame once it completely receives it
Hop Count

38. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
255.255.192.0

39. EIGRP: How do you view if there are any successor routes?
255.255.255.224
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Show ip eigrp topology
Switch forwards the frame as soon as it can

40. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
255.255.0.0
IEEE 802.3ab
/22
14 per network

41. EIGRP: What is the default administrative distance?
Packets
1 - everything hooked to the hub is in the same collision domain
100
Bellman-Ford

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

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43. Rip Timers: How long is the default for Holddown timer.
180
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
180 seconds
Presentation

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

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

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46. Subnetting: What is a /16 in Decimal
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
255.255.0.0
/24
/9

47. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
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
Switch forwards frame once it completely receives it
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

48. OSPF: how do you change the cost of an interface for OSPF?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
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
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

49. Subnetting: What is a 255.255.252.0 in prefix notation
/22
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Packets

50. What is the boot sequence for Cisco Routers?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
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