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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: What does v2 have that v1 does not?
255.255.255.252
110
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
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

2. 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
1-65535
IEEE 802.3z
Show ip eigrp topology

3. What is Layer 2 in the OSI Model?
D
Data-Link
Transport
126 per network

4. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Closest multiple of the magic number that is not over the interesting octets number.
120
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

5. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
Presentation
Layer 2
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Network

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

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7. Using the magic number how to you figure the broadcast?
IEEE 802.3u
Add the magic number to the network minus 1
Segments
Every 4 ip's

8. What is the Transport PDU called?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
DUAL: Difusing Update Algorithm
/24
Segments

9. What is Layer 7 in the OSI Model?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
DUAL: Difusing Update Algorithm
Application
180 seconds

10. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
255.255.255.224

11. RIP: What Algorithm is used in RIP>
Bellman-Ford
255.255.255.128
Closest multiple of the magic number that is not over the interesting octets number.
IEEE 802.3ab

12. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
Bellman-Ford
Layer 2
Session

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

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14. What is the metric for RIP
Hop Count
2 - the bridge separates the collision domain
Network
Segments

15. EIGRP: What packet is used to search for networks?
Query and other router responds with a REPLY packet.
255.255.255.224
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

16. Rip Timers: How long is the default for Flush timer.
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
60
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

17. What is Layer 1 in the OSI Model?
Switch forwards the frame as soon as it can
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Physical
R

18. RIP Timers: What is an Flush Timer?
/22
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.
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Application

19. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
180 seconds
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

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

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21. EIGRP: What is the range of Autonomous System numbers?
D
255.255.0.0
1-65535
Network

22. Rip: What is the command to enable Ripv2?
180 seconds
R1(config)#router rip - R1(config-router)#version 2
180
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

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

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24. What are the comands to set the clock rate in a serial connection?
2 hosts
DCE
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

25. RIP Timers: What is an Holddown Timer?
Query and other router responds with a REPLY packet.
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Application
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

26. IEEE Standards: Gibabit Ethernet (Fibre)
IEEE 802.3z
Pins 1+2 swap places with pins 3+6
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Network

27. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Layer 2
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

28. EIGRP: What is the hello packet used for?
100
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 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

29. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Packets

30. OSPF: What Algorithm is used?
Shortest path first - (SPF)
Layer 2
Every 32 ip's
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

31. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
2 - each port is it's own collision domain
Session
255.255.255.252
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

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

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33. What Layer does CDP operate at?
Layer 2
Data-Link
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

34. Symbol for Rip on a Show ip route
255.255.192.0
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
R
255.255.255.128

35. IEEE Standards: Ethernet
120
IEEE 802.3
180
1-65535

36. What is Layer 3 in the OSI Model?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Transport
Network
/22

37. OSPF: What is the default administrative distance?
Add the magic number to the network minus 1
110
Query and other router responds with a REPLY packet.
2 - each port is it's own collision domain

38. What are the commands to setup SSH?
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 8 ip's
Packets
Query and other router responds with a REPLY packet.

39. What is the boot sequence for Cisco Routers?
Every 128 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Presentation
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

40. Rip and EIGRP use what to keep other routers aware of their status?
Every 32 ip's
/9
D
Periodic Updates of their routing table

41. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
255.255.192.0
Switch forwards the frame as soon as it can
2 hosts

42. Subnetting: What is a /27 in Decimal
Every 4 ip's
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Every 8 ip's
255.255.255.224

43. RIP Timers: What is an invalid Timer?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
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.
Every 8 ip's

44. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
2 - the bridge separates the collision domain
Every 4 ip's
255.255.0.0
Network

45. Switching Methods: What is Store and Forward?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
2 hosts
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

46. CABLES: What is the T568B Pinout Standard?
IEEE 802.3ab
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
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

47. Subnetting: What is a /16 in Decimal
Network
110
IEEE 802.3
255.255.0.0

48. How do you find the magic number for subnetting?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
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
IEEE 802.3z
110

49. Rip Timers: How long is the default for Invalid timer.
Every 8 ip's
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
180 seconds
Every 4 ip's

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

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