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CCENT

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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 is Layer 7 in the OSI Model?
30 per network
Application
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
R

2. What is the layer 3 PDU called?
Network
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
Layer 2

3. IEEE Standards: Ethernet
IEEE 802.3
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Transport
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

4. What is the Transport PDU called?
255.255.255.224
Segments
2 hosts
DUAL: Difusing Update Algorithm

5. CABLES: What is the T568B Pinout Standard?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
255.255.255.128
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

6. Switching Methods: What is Cut-through?
Switch forwards the frame as soon as it can
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Frames
IEEE 802.3z

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

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8. Rip: how do hold down timers work?
IEEE 802.3ab
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
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

9. Subnetting: What is a 255.128.0.0 in prefix notation
100
R
/9
Frames

10. EIGRP: How do you view if there are any successor routes?
Show ip eigrp topology
Every 16 ip's
DCE
180

11. EIGRP: What packet is used to search for networks?
Switch forwards the frame as soon as it can
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Query and other router responds with a REPLY packet.
Segments

12. IEEE Standards: Gibabit Ethernet (Fibre)
IEEE 802.3z
Network
255.255.255.224
255.255.255.128

13. OSPF: What is the process used by OSPF to build a routing table (step by step)
255.255.255.128
/22
Pins 1+2 swap places with pins 3+6
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

14. Name the TCP/IP Layers
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
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
Switch forwards frame once it completely receives it
2 - the bridge separates the collision domain

15. What is the metric for EIGRP
/9
IEEE 802.3ab
Bandwidth - Delay - reliability and Load
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.

16. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
Bandwidth - Delay - reliability and Load
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

17. Rip: What does v2 have that v1 does not?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
R1(config)#router rip - R1(config-router)#version 2
Every 64 ip's
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

18. Switching Methods: What is Store and Forward?
DCE
IEEE 802.3
Switch forwards frame once it completely receives it
30 per network

19. Rip Timers: How long is the default for Invalid timer.
Every 4 ip's
180 seconds
Data-Link
IEEE 802.3ab

20. 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. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Every 32 ip's
180

21. CABLES: What is the difference between T568A and T568B?
/28
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Pins 1+2 swap places with pins 3+6

22. Symbol for Rip on a Show ip route
Every 16 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
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
R

23. Subnetting: What is a /16 in Decimal
255.255.0.0
D
Transport
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

24. Subnetting: What is a /27 in Decimal
Every 32 ip's
Every 8 ip's
Every 16 ip's
255.255.255.224

25. IEEE Standards: Fast Ethernet
Data-Link
Switch forwards the frame as soon as it can
/24
IEEE 802.3u

26. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Query and other router responds with a REPLY packet.
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
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

27. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Presentation
Layer 2
126 per network

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

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29. What is Layer 2 in the OSI Model?
Data-Link
126 per network
Transport
255.255.255.224

30. OSPF: What Algorithm is used?
Every 8 ip's
Bandwidth - Delay - reliability and Load
Frames
Shortest path first - (SPF)

31. Subnetting: What is a 255.255.255.0 in prefix notation
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
/24
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
255.255.192.0

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

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33. What is the metric for RIP
Session
Hop Count
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Router(config)#ip route {exit-interface}

34. EIGRP: What is the name of the algorithm used for EIGRP?
Transport
DUAL: Difusing Update Algorithm
D
1 - everything hooked to the hub is in the same collision domain

35. What is the boot sequence for Cisco Routers?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Hop Count
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Session

36. 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
Hop Count
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Every 8 ip's

37. EIGRP: What packet is used to propagate routing information?
IEEE 802.3z
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
1-65535
Every 128 ip's

38. OSPF: What is the default administrative distance?
126 per network
110
Every 32 ip's
Application

39. What is the Data-Link PDU called?
Frames
R1(config)#router rip - R1(config-router)#version 2
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Switch forwards frame once it completely receives it

40. Subnetting: What is a /30 in Decimal
Transport
255.255.255.252
2 - each port is it's own collision domain
255.255.255.224

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

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42. Command for a static route with exit interface
Every 64 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Show ip eigrp topology
Router(config)#ip route {exit-interface}

43. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
R1(config)#router rip - R1(config-router)#version 2
DCE
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

44. EIGRP: What is the range of Autonomous System numbers?
Segments
1-65535
Router(config)#ip route {network address} {subnet-mask}
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

45. What is Layer 1 in the OSI Model?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
/9
Physical
Router(config)#ip route {exit-interface}

46. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
180 seconds
2 hosts
Data-Link

47. Using the magic number how to you figure the broadcast?
Presentation
Router(config)#ip route {network address} {subnet-mask}
Every 32 ip's
Add the magic number to the network minus 1

48. Rip: Command to prevent rip updates on an interface
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
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
IEEE 802.3ab

49. What is the Network PDU called?
Packets
255.255.255.128
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Network

50. Subnetting: What is a 255.255.255.240 in prefix notation
Shortest path first - (SPF)
/28
R1(config)#router rip - R1(config-router)#version 2
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.

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