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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 /26

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2. What is the layer 3 PDU called?
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
Closest multiple of the magic number that is not over the interesting octets number.
Packets
Session

3. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
/24
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
/28
126 per network

4. Rip: What does v2 have that v1 does not?
Query and other router responds with a REPLY 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
Periodic Updates of their routing table
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

5. What gets the clock rate - DCE or DTE?
255.255.255.224
Pins 1+2 swap places with pins 3+6
DCE
Segments

6. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
Network
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Segments

7. What are the comands to set the clock rate in a serial connection?
Network
Router(config)#ip route {network address} {subnet-mask}
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
/28

8. CABLES: What is the difference between T568A and T568B?
62 per network
Pins 1+2 swap places with pins 3+6
126 per network
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

9. Symbol for EIGRP on a Show ip route
D
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Segments
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

10. Rip: What causes a triggered update?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Presentation
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Pins 1+2 swap places with pins 3+6

11. EIGRP: What packet is used to propagate routing information?
Every 4 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Segments
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

12. What is Layer 7 in the OSI Model?
Shortest path first - (SPF)
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Application
100

13. Command for a static route with exit interface
Packets
Network
Router(config)#ip route {exit-interface}
1 - everything hooked to the hub is in the same collision domain

14. Switching Methods: What is Store and Forward?
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
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
255.255.255.252
Switch forwards frame once it completely receives it

15. Rip Timers: How long is the default for Flush timer.
60
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Hop Count
IEEE 802.3ab

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

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17. IEEE Standards: Ethernet
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
110
IEEE 802.3

18. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Network

19. Subnetting: What is a /27 in Decimal
D
Application
255.255.255.224
Every 16 ip's

20. EIGRP: What is the default administrative distance?
100
2 hosts
Switch forwards frame once it completely receives it
30 per network

21. How many Collision domains are there on a with 1 hub and 2 computers?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Add the magic number to the network minus 1
1 - everything hooked to the hub is in the same collision domain
Hop Count

22. Using the magic number how to you figure the network?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
100
Closest multiple of the magic number that is not over the interesting octets number.
D

23. Rip Timers: How long is the default for Holddown timer.
180
Bandwidth - Delay - reliability and Load
Hop Count
Router(config)#ip route {exit-interface}

24. What is Layer 2 in the OSI Model?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Presentation
Data-Link

25. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
Session
Every 32 ip's
Frames

26. What is the metric for EIGRP
Bandwidth - Delay - reliability and Load
Transport
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
IEEE 802.3z

27. RIP Timers: What is an Flush Timer?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
2 - each port is it's own collision domain
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.
Every 128 ip's

28. What is Layer 1 in the OSI Model?
IEEE 802.3u
Physical
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Show ip eigrp topology

29. Rip: how do hold down timers work?
/22
Data-Link
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
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

30. What is Layer 6 in the OSI Model?
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
Query and other router responds with a REPLY packet.
Presentation
Router(config)#ip route {exit-interface}

31. What is the Transport PDU called?
Segments
2 - each port is it's own collision domain
R1(config)#router rip - R1(config-router)#version 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

32. Name the TCP/IP Layers
Closest multiple of the magic number that is not over the interesting octets number.
2 - each port is it's own collision domain
255.255.255.128
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

33. RIP: What is the default Administrative Distance?
/9
120
Every 32 ip's
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

34. Subnetting: What is a 255.255.252.0 in prefix notation
110
180 seconds
Session
/22

35. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
62 per network
R1(config)#router rip - R1(config-router)#version 2
Add the magic number to the network minus 1

36. What is the boot sequence for Cisco Routers?
Closest multiple of the magic number that is not over the interesting octets number.
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Every 128 ip's
255.255.192.0

37. What is the Data-Link PDU called?
30 per network
Frames
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
IEEE 802.3u

38. OSPF: how do you change the cost of an interface for OSPF?
Add the magic number to the network minus 1
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.
60
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

39. What is the layer 2 PDU called?
126 per network
IEEE 802.3ab
Frames
Packets

40. Rip and EIGRP use what to keep other routers aware of their status?
Every 16 ip's
Router(config)#ip route {network address} {subnet-mask}
Closest multiple of the magic number that is not over the interesting octets number.
Periodic Updates of their routing table

41. Switching Methods: What is Cut-through?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
180 seconds
Switch forwards the frame as soon as it can
Periodic Updates of their routing table

42. What is Layer 5 in the OSI Model?
Session
Every 32 ip's
255.255.192.0
255.255.255.252

43. IEEE Standards: Gibabit Ethernet (Copper)
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
100
IEEE 802.3ab
Every 64 ip's

44. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
IEEE 802.3z
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
R
R3(config)#router rip - R3(config-router)#network 192.168.1.2

45. Subnetting: What is a /25 in Decimal
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)#
255.255.255.128
Every 8 ip's
Router(config)#ip route {exit-interface}

46. OSPF: What Algorithm is used?
180
2 - each port is it's own collision domain
Shortest path first - (SPF)
Segments

47. Rip: What is the command to enable Ripv2?
Packets
/24
62 per network
R1(config)#router rip - R1(config-router)#version 2

48. OSPF: What does OSPF use for its metric?
Network
D
Frames
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

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

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

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