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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 is Layer 2 in the OSI Model?
Data-Link
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
/22
Session

2. RIP: What Algorithm is used in RIP>
Periodic Updates of their routing table
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Bellman-Ford
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

3. What is the layer 4 PDU called?
Segments
60
Closest multiple of the magic number that is not over the interesting octets number.
Periodic Updates of their routing table

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

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5. RIP: What is the default Administrative Distance?
/9
Router(config)#ip route {network address} {subnet-mask}
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
120

6. EIGRP: What packet is used to propagate routing information?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Pins 1+2 swap places with pins 3+6
Add the magic number to the network minus 1
Layer 2

7. Subnetting: What is a /18 in Decimal
Hop Count
255.255.192.0
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
DCE

8. Subnetting: What is a /30 in Decimal
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
255.255.255.252
IEEE 802.3u
126 per network

9. What is the metric for RIP
Query and other router responds with a REPLY packet.
Hop Count
255.255.255.252
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

10. RIP Timers: What is an invalid Timer?
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.
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Every 8 ip's
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

11. OSPF: What Algorithm is used?
Show ip eigrp topology
Data-Link
Shortest path first - (SPF)
R

12. What is the boot sequence for Cisco Routers?
Pins 1+2 swap places with pins 3+6
Add the magic number to the network minus 1
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

13. Using the magic number how to you figure the network?
IEEE 802.3
Closest multiple of the magic number that is not over the interesting octets number.
Frames
Session

14. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
IEEE 802.3u
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
255.255.255.252

15. Command for a static route with 'Next Hop' Address
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
Frames
Router(config)#ip route {network address} {subnet-mask}
Network

16. What are the commands to setup SSH?
/24
Every 32 ip's
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)#

17. Rip: Command to prevent rip updates on an interface
Transport
Add the magic number to the network minus 1
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
D

18. OSPF: What does OSPF use for its metric?
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
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

19. Subnetting: What is a /27 in Decimal
/24
120
14 per network
255.255.255.224

20. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
2 - the bridge separates the collision domain
62 per network
Presentation
30 per network

21. What is Layer 4 in the OSI Model?
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
R1(config)#router rip - R1(config-router)#version 2
Transport
IEEE 802.3ab

22. Switching Methods: What is Fragment-free?
Physical
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
2 - the bridge separates the collision domain
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

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

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24. IEEE Standards: Fast Ethernet
Every 4 ip's
Frames
Session
IEEE 802.3u

25. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
IEEE 802.3u
DCE
/24

26. RIP Timers: What is an Flush Timer?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
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.
14 per network
Every 64 ip's

27. How do you find the magic number for subnetting?
62 per network
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Switch forwards the frame as soon as it can
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

28. 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
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
D
255.255.255.224

29. Name the OSI Layers
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
120
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
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.

30. IEEE Standards: Ethernet
IEEE 802.3
Session
Presentation
Application

31. Command for a static route with exit interface
180
Router(config)#ip route {exit-interface}
Frames
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

32. Symbol for Rip on a Show ip route
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
R

33. Subnetting: What is a 255.128.0.0 in prefix notation
255.255.255.128
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 - everything hooked to the hub is in the same collision domain
/9

34. Rip Timers: How long is the default for Invalid timer.
Every 32 ip's
180 seconds
Network
Segments

35. IEEE Standards: Gibabit Ethernet (Fibre)
Hop Count
IEEE 802.3z
Transport
30 per network

36. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
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.
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
14 per network
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

37. EIGRP: How do you view if there are any successor routes?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Packets
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Show ip eigrp topology

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

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39. Symbol for EIGRP on a Show ip route
1-65535
IEEE 802.3ab
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
D

40. What is the layer 3 PDU called?
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.
Packets
Segments
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

41. Rip and EIGRP use what to keep other routers aware of their status?
Pins 1+2 swap places with pins 3+6
IEEE 802.3u
Router(config)#ip route {exit-interface}
Periodic Updates of their routing table

42. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
255.255.255.128
126 per network
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
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

43. What is Layer 1 in the OSI Model?
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Physical
IEEE 802.3z
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

44. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Periodic Updates of their 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
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 802.3ab

45. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
30 per network
Hop Count
/22
62 per network

46. CABLES: What is the T568B Pinout Standard?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Switch forwards the frame as soon as it can
Switch forwards frame once it completely receives it
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

47. 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
IEEE 802.3u
Router(config)#ip route {exit-interface}
/22

48. Rip Timers: How long is the default for Flush timer.
60
IEEE 802.3
180 seconds
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

49. Rip Timers: How long is the default for Holddown timer.
180
/9
30 per network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

50. What Layer does CDP operate at?
Segments
Layer 2
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown