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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. Switching Methods: What is Store and Forward?
126 per network
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Switch forwards frame once it completely receives it

2. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Layer 2
2 - the bridge separates the collision domain
Every 32 ip's
Closest multiple of the magic number that is not over the interesting octets number.

3. RIP: What Algorithm is used in RIP>
Bellman-Ford
Shortest path first - (SPF)
2 - the bridge separates the collision domain
Bandwidth - Delay - reliability and Load

4. 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
126 per network
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
180 seconds

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

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6. What is Layer 3 in the OSI Model?
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)#
IEEE 802.3u
DCE
Network

7. What is Layer 6 in the OSI Model?
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
Hop Count
Presentation

8. What are the comands to set the clock rate in a serial connection?
Router(config)#ip route {network address} {subnet-mask}
2 - each port is it's own collision domain
R3(config)#router rip - R3(config-router)#network 192.168.1.2
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

9. OSPF: What Algorithm is used?
Shortest path first - (SPF)
Bellman-Ford
Add the magic number to the network minus 1
IEEE 802.3

10. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
Data-Link
Every 128 ip's
2 - the bridge separates the collision domain

11. Subnetting: What is a /16 in Decimal
180 seconds
255.255.0.0
255.255.192.0
110

12. Subnetting: What is a /27 in Decimal
Hop Count
255.255.255.224
Closest multiple of the magic number that is not over the interesting octets number.
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

13. Subnetting: What is a 255.255.255.0 in prefix notation
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
/24
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Session

14. What is Layer 5 in the OSI Model?
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
Session
Router(config)#ip route {network address} {subnet-mask}

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

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16. OSPF: how do you change the cost of an interface for OSPF?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
62 per network
Data-Link

17. What gets the clock rate - DCE or DTE?
DCE
2 - the bridge separates the collision domain
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

18. 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
Session
1 - everything hooked to the hub is in the same collision domain
255.255.0.0

19. Subnetting: What is a 255.255.255.240 in prefix notation
/28
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Switch forwards frame once it completely receives it
Every 32 ip's

20. What is the layer 2 PDU called?
126 per network
Frames
D
/24

21. IEEE Standards: Gibabit Ethernet (Fibre)
IEEE 802.3z
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
/22
/24

22. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
R1(config)#router rip - R1(config-router)#version 2
Layer 2
62 per network
30 per network

23. What is Layer 4 in the OSI Model?
Segments
Show ip eigrp topology
Transport
/28

24. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Show ip eigrp topology
Packets

25. IEEE Standards: Fast Ethernet
IEEE 802.3u
255.255.255.252
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Every 128 ip's

26. Subnetting: What is a /18 in Decimal
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
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. What is the Network PDU called?
Frames
Packets
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

28. Rip Timers: How long is the default for Holddown timer.
14 per network
Router(config)#ip route {network address} {subnet-mask}
Physical
180

29. What is the Data-Link PDU called?
Frames
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Packets
Data-Link

30. EIGRP: What is the hello packet used for?
2 hosts
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Shortest path first - (SPF)
Every 32 ip's

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

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32. CABLES: What is the T568B Pinout Standard?
Add the magic number to the network minus 1
Query and other router responds with a REPLY packet.
D
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

33. EIGRP: What packet is used to search for networks?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Query and other router responds with a REPLY packet.
Network

34. Symbol for Rip on a Show ip route
/22
Closest multiple of the magic number that is not over the interesting octets number.
/28
R

35. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
2 - the bridge separates the collision domain
30 per network
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
62 per network

36. Using the magic number how to you figure the broadcast?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Add the magic number to the network minus 1
1 - everything hooked to the hub is in the same collision domain
R1(config)#router rip - R1(config-router)#version 2

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

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38. Name the OSI Layers
Shortest path first - (SPF)
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
180

39. What Layer does CDP operate at?
Every 4 ip's
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Layer 2
255.255.255.252

40. 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
Query and other router responds with a REPLY packet.
Router(config)#ip route {exit-interface}
255.255.0.0

41. Subnetting: What is a /25 in Decimal
DUAL: Difusing Update Algorithm
255.255.255.128
IEEE 802.3ab
/9

42. How do you find the magic number for subnetting?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
100
2 - each port is it's own collision domain
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

43. What are the commands to setup SSH?
2 hosts
R
Physical
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)#

44. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
IEEE 802.3ab
Every 16 ip's
IEEE 802.3

45. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Every 128 ip's
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
DCE
Network

46. IEEE Standards: Gibabit Ethernet (Copper)
180
180 seconds
IEEE 802.3ab
Session

47. Subnetting: What is a 255.255.252.0 in prefix notation
DCE
1-65535
/22
Bellman-Ford

48. What is the metric for RIP
Layer 2
110
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Hop Count

49. Rip Timers: How long is the default for Invalid timer.
180
Segments
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
180 seconds

50. 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
Presentation
1 - everything hooked to the hub is in the same collision domain
Router(config)#ip route {exit-interface}