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

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2. Subnetting: What is a /30 in Decimal
110
255.255.255.252
2 - each port is it's own collision domain
180 seconds

3. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
IEEE 802.3ab
Segments
126 per network
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)#

4. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
100
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

5. Name the OSI Layers
Closest multiple of the magic number that is not over the interesting octets number.
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (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
Every 128 ip's

6. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
1 - everything hooked to the hub is in the same collision domain
60
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

7. Subnetting: What is a 255.255.252.0 in prefix notation
Layer 2
/22
Periodic Updates of their routing table
14 per network

8. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
2 hosts
DCE
/28
Every 128 ip's

9. OSPF: What does OSPF use for its metric?
30 per network
Session
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
R1(config)#router rip - R1(config-router)#version 2

10. EIGRP: What is the name of the algorithm used for EIGRP?
Frames
Show ip eigrp topology
DUAL: Difusing Update Algorithm
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

11. What gets the clock rate - DCE or DTE?
Router(config)#ip route {network address} {subnet-mask}
120
DCE
D

12. EIGRP: What packet is used to search for networks?
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
30 per network
Switch forwards frame once it completely receives it

13. Subnetting: What is a 255.255.255.240 in prefix notation
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Router(config)#ip route {network address} {subnet-mask}
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
/28

14. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
R3(config)#router rip - R3(config-router)#network 192.168.1.2
1-65535
Layer 2

15. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Every 32 ip's
2 - the bridge separates the collision domain
IEEE 802.3z
Packets

16. OSPF: how do you change the cost of an interface for OSPF?
Every 128 ip's
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Segments
Shortest path first - (SPF)

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

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18. Rip Timers: How long is the default for Flush timer.
D
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
DUAL: Difusing Update Algorithm
60

19. What is the Data-Link PDU called?
Router(config)#ip route {exit-interface}
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Frames
Packets

20. EIGRP: What packet is used to propagate routing information?
60
/9
Every 128 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

21. Subnetting: What is a 255.128.0.0 in prefix notation
Switch forwards the frame as soon as it can
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
/9

22. What is the boot sequence for Cisco Routers?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
255.255.255.224
Every 128 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

23. EIGRP: What is the range of Autonomous System numbers?
Add the magic number to the network minus 1
255.255.255.224
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
1-65535

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

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25. Using the magic number how to you figure the broadcast?
255.255.0.0
Switch forwards frame once it completely receives it
Transport
Add the magic number to the network minus 1

26. What is the layer 4 PDU called?
Segments
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Frames

27. IEEE Standards: Gibabit Ethernet (Copper)
Session
DCE
IEEE 802.3ab
IEEE 802.3z

28. Subnetting: What is a 255.255.255.0 in prefix notation
180 seconds
2 - the bridge separates the collision domain
Bandwidth - Delay - reliability and Load
/24

29. RIP: What Algorithm is used in RIP>
Shortest path first - (SPF)
Bellman-Ford
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
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

30. Switching Methods: What is Store and Forward?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Switch forwards frame once it completely receives it
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:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

31. RIP Timers: What is an Holddown Timer?
Every 64 ip's
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
Bandwidth - Delay - reliability and Load
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

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

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33. RIP Timers: What is an Flush Timer?
Bandwidth - Delay - reliability and Load
180 seconds
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

34. Subnetting: What is a /16 in Decimal
255.255.0.0
Every 4 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

35. Rip: What does v2 have that v1 does not?
255.255.255.252
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
120

36. 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
IEEE 802.3u
255.255.255.252
Frames

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

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38. OSPF: What is the process used by OSPF to build a routing table (step by step)
110
Transport
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
2 - the bridge separates the collision domain

39. Switching Methods: What is Cut-through?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
2 hosts
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Switch forwards the frame as soon as it can

40. Subnetting: What is a /25 in Decimal
255.255.255.128
Router(config)#ip route {exit-interface}
Pins 1+2 swap places with pins 3+6
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

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

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42. Command for a static route with exit interface
Transport
Router(config)#ip route {exit-interface}
Network
Every 32 ip's

43. What is the metric for RIP
Hop Count
Segments
Every 64 ip's
Shortest path first - (SPF)

44. What are the comands to set the clock rate in a serial connection?
Session
110
Periodic Updates of their routing table
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

45. What is the layer 2 PDU called?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Frames
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
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

46. Rip: What is the command to enable Ripv2?
120
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
R1(config)#router rip - R1(config-router)#version 2

47. Rip: how do hold down timers work?
30 per network
Frames
60
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

48. IEEE Standards: Gibabit Ethernet (Fibre)
255.255.255.224
Data-Link
/24
IEEE 802.3z

49. How many Collision domains are there on a with 1 hub and 2 computers?
255.255.192.0
R1(config)#router rip - R1(config-router)#version 2
1 - everything hooked to the hub is in the same collision domain
180 seconds

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

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