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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. OSPF: What is the default administrative distance?
R
110
Network
14 per network

2. Switching Methods: What is Fragment-free?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
1-65535
255.255.192.0
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

3. What is Layer 5 in the OSI Model?
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
Session
Every 8 ip's

4. Subnetting: What is a /27 in Decimal
180
255.255.255.224
126 per network
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

5. Switching Methods: What is Store and Forward?
Every 64 ip's
Switch forwards frame once it completely receives it
Layer 2
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

6. What is the metric for RIP
1 - everything hooked to the hub is in the same collision domain
Every 128 ip's
IEEE 802.3
Hop Count

7. IEEE Standards: Fast Ethernet
DUAL: Difusing Update Algorithm
IEEE 802.3u
255.255.192.0
Session

8. RIP Timers: What is an Flush Timer?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
110
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. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

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

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10. OSPF: What Algorithm is used?
255.255.255.224
Show ip eigrp topology
Shortest path first - (SPF)
Layer 2

11. CABLES: What is the T568B Pinout Standard?
2 hosts
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Every 64 ip's

12. Symbol for EIGRP on a Show ip route
D
Transport
Session
Switch forwards the frame as soon as it can

13. CABLES: What is the difference between T568A and T568B?
Switch forwards frame once it completely receives it
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Pins 1+2 swap places with pins 3+6
R

14. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
255.255.255.224
2 - each port is it's own collision domain
2 - the bridge separates the collision domain
Bellman-Ford

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

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16. IEEE Standards: Gibabit Ethernet (Fibre)
126 per network
Physical
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
IEEE 802.3z

17. What is the layer 3 PDU called?
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.
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Packets
Segments

18. Subnetting: What is a 255.255.252.0 in prefix notation
2 - each port is it's own collision domain
DUAL: Difusing Update Algorithm
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
/22

19. Rip: how do hold down timers work?
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
Network
Data-Link

20. What Layer does CDP operate at?
Closest multiple of the magic number that is not over the interesting octets number.
Query and other router responds with a REPLY packet.
DUAL: Difusing Update Algorithm
Layer 2

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

22. What is Layer 6 in the OSI Model?
Presentation
Every 4 ip's
IEEE 802.3u
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

23. RIP: What is the default Administrative Distance?
/28
120
1 - everything hooked to the hub is in the same collision domain
30 per network

24. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Transport
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
14 per network
Physical

25. Name the TCP/IP Layers
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
30 per network
255.255.192.0

26. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
DCE
2 - each port is it's own collision domain
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

27. EIGRP: What packet is used to search for networks?
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
DCE
Query and other router responds with a REPLY packet.

28. RIP: What Algorithm is used in RIP>
Presentation
Bellman-Ford
Every 128 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.

29. EIGRP: What is the hello packet used for?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Layer 2
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

30. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
/9
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Show ip eigrp topology

31. EIGRP: How do you view if there are any successor routes?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Show ip eigrp topology
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Every 32 ip's

32. How do you find the magic number for subnetting?
IEEE 802.3ab
D
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Bellman-Ford

33. Name the OSI Layers
Every 4 ip's
Every 128 ip's
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
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

34. Rip Timers: How long is the default for Flush timer.
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Query and other router responds with a REPLY packet.
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
60

35. OSPF: What is the process used by OSPF to build a routing table (step by step)
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. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
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 128 ip's

36. What is the layer 2 PDU called?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
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
Frames
Periodic Updates of their routing table

37. Subnetting: What is a 255.255.255.0 in prefix notation
Switch forwards the frame as soon as it can
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Add the magic number to the network minus 1
/24

38. What is Layer 2 in the OSI Model?
Data-Link
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
180
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

39. What is the metric for EIGRP
Switch forwards frame once it completely receives it
Bandwidth - Delay - reliability and Load
Pins 1+2 swap places with pins 3+6
2 - the bridge separates the collision domain

40. Symbol for Rip on a Show ip route
Pins 1+2 swap places with pins 3+6
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.
R

41. Rip Timers: How long is the default for Invalid timer.
Network
180 seconds
D
Transport

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

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43. What gets the clock rate - DCE or DTE?
Switch forwards the frame as soon as it can
/24
DCE
Segments

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

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45. What is Layer 3 in the OSI Model?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Frames
DUAL: Difusing Update Algorithm
Network

46. EIGRP: What is the default administrative distance?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
100
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Periodic Updates of their routing table

47. CABLES: What is the T568A Pinout Standard?
IEEE 802.3u
IEEE 802.3ab
110
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

48. OSPF: how do you change the cost of an interface for OSPF?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
255.255.255.252
Packets

49. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
Packets
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Periodic Updates of their routing table

50. What is Layer 7 in the OSI Model?
Application
Hop Count
120
60