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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: How many hosts per network if the subnet mask is 255.255.255.252
2 hosts
IEEE 802.3ab
2 - each port is it's own collision domain
Every 128 ip's

2. What is Layer 1 in the OSI Model?
255.255.0.0
Physical
Segments
30 per network

3. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
255.255.255.252
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Switch forwards frame once it completely receives it
/22

4. Subnetting: What is a /25 in Decimal
2 - the bridge separates the collision domain
255.255.255.128
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Closest multiple of the magic number that is not over the interesting octets number.

5. What is Layer 6 in the OSI Model?
2 hosts
Presentation
/22
14 per network

6. What is Layer 2 in the OSI Model?
Query and other router responds with a REPLY packet.
Pins 1+2 swap places with pins 3+6
Data-Link
62 per network

7. Rip: how do hold down timers work?
Pins 1+2 swap places with pins 3+6
/24
Router(config)#ip route {network address} {subnet-mask}
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

8. What is Layer 3 in the OSI Model?
IEEE 802.3ab
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

9. 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
R1(config)#router rip - R1(config-router)#version 2
Session
180 seconds

10. Subnetting: What is a 255.255.255.240 in prefix notation
/28
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 4 ip's
DUAL: Difusing Update Algorithm

11. What gets the clock rate - DCE or DTE?
1 - everything hooked to the hub is in the same collision domain
Switch forwards the frame as soon as it can
Router(config)#ip route {exit-interface}
DCE

12. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
14 per network
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Frames
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.

13. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
DUAL: Difusing Update Algorithm
Bandwidth - Delay - reliability and Load
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

14. Subnetting: What is a 255.255.255.0 in prefix notation
/24
100
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Switch forwards the frame as soon as it can

15. EIGRP: What is the hello packet used for?
Switch forwards the frame as soon as it can
Network
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
255.255.255.252

16. EIGRP: What is the default administrative distance?
Application
Bandwidth - Delay - reliability and Load
Packets
100

17. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
IEEE 802.3u
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
180

18. What is the layer 2 PDU called?
14 per network
R
Session
Frames

19. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
D
180 seconds
Hop Count
126 per network

20. IEEE Standards: Fast Ethernet
IEEE 802.3u
Router(config)#ip route {exit-interface}
Add the magic number to the network minus 1
Periodic Updates of their routing table

21. Switching Methods: What is Store and Forward?
Frames
Switch forwards frame once it completely receives it
14 per network
255.255.192.0

22. EIGRP: How do you view if there are any successor routes?
Query and other router responds with a REPLY packet.
Show ip eigrp topology
Pins 1+2 swap places with pins 3+6
Packets

23. Rip Timers: How long is the default for Holddown timer.
14 per network
110
180
Bandwidth - Delay - reliability and Load

24. Rip Timers: How long is the default for Invalid timer.
/9
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
255.255.255.128
180 seconds

25. RIP: What is the default Administrative Distance?
Closest multiple of the magic number that is not over the interesting octets number.
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
62 per network
120

26. OSPF: What is the process used by OSPF to build a routing table (step by step)
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
IEEE 802.3u
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)#
120

27. OSPF: how do you change the cost of an interface for OSPF?
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
/9
Transport

28. What are the comands to set the clock rate in a serial connection?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
1-65535
Every 64 ip's
100

29. EIGRP: What packet is used to propagate routing information?
Segments
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
DUAL: Difusing Update Algorithm
100

30. Rip: Command to prevent rip updates on an interface
2 - each port is it's own collision domain
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
100
Every 32 ip's

31. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
255.255.255.128
Application
IEEE 802.3

32. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Hop Count
2 - the bridge separates the collision domain
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Router(config)#ip route {exit-interface}

33. How do you find the magic number for subnetting?
Show ip eigrp topology
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

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

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

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36. What Layer does CDP operate at?
Layer 2
126 per network
62 per network
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.

37. What is the layer 3 PDU called?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Packets
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
/22

38. Symbol for Rip on a Show ip route
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Transport
R
Layer 2

39. 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.
Pins 1+2 swap places with pins 3+6
100
IEEE 802.3z

40. OSPF: What Algorithm is used?
Shortest path first - (SPF)
Hop Count
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Every 8 ip's

41. Rip Timers: How long is the default for Flush timer.
Frames
Data-Link
Application
60

42. Subnetting: What is a /18 in Decimal
IEEE 802.3
255.255.192.0
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
2 - the bridge separates the collision domain

43. CABLES: What is the difference between T568A and T568B?
IEEE 802.3z
30 per network
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

44. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
Segments
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.
/24
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

45. What is the boot sequence for Cisco Routers?
DUAL: Difusing Update Algorithm
Switch forwards the frame as soon as it can
Every 4 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

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

47. Subnetting: What is a /16 in Decimal
126 per network
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
255.255.0.0
Periodic Updates of their routing table

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

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49. What is the layer 4 PDU called?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Segments
180 seconds
Presentation

50. OSPF: What does OSPF use for its metric?
Add the magic number to the network minus 1
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
255.255.0.0
Transport