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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 Fragment-free?
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
2 - each port is it's own collision domain
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

2. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
R
/24
Bandwidth - Delay - reliability and Load

3. EIGRP: What is the hello packet used for?
/9
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 128 ip's
60

4. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
255.255.255.252
62 per network
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
110

5. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
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
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Session

6. What are the comands to set the clock rate in a serial connection?
Router(config)#ip route {exit-interface}
100
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Application

7. Rip Timers: How long is the default for Invalid timer.
/28
180 seconds
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

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

9. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
R3(config)#router rip - R3(config-router)#network 192.168.1.2
2 - each port is it's own collision domain
Network

10. Command for a static route with 'Next Hop' Address
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
/24
DUAL: Difusing Update Algorithm
Router(config)#ip route {network address} {subnet-mask}

11. What is Layer 4 in the OSI Model?
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.
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Router(config)#ip route {exit-interface}
Transport

12. EIGRP: What is the range of Autonomous System numbers?
1-65535
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Switch forwards the frame as soon as it can
30 per network

13. Rip: Command to prevent rip updates on an interface
180
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
126 per network
Shortest path first - (SPF)

14. Name the OSI Layers
1 - everything hooked to the hub is in the same collision domain
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
255.255.192.0
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.

15. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
IEEE 802.3z
IEEE 802.3
Bellman-Ford
14 per network

16. Using the magic number how to you figure the network?
Closest multiple of the magic number that is not over the interesting octets number.
Bandwidth - Delay - reliability and Load
Presentation
255.255.255.224

17. OSPF: What is the default administrative distance?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
110
Periodic Updates of their routing table
Every 64 ip's

18. What is Layer 3 in the OSI Model?
Application
Network
D
Bellman-Ford

19. What is Layer 1 in the OSI Model?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
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
Router(config)#ip route {exit-interface}
Physical

20. What is the layer 4 PDU called?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Segments
Add the magic number to the network minus 1

21. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
/9
R3(config)#router rip - R3(config-router)#network 192.168.1.2
2 - the bridge separates the collision domain
Shortest path first - (SPF)

22. RIP Timers: What is an invalid Timer?
255.255.192.0
Query and other router responds with a REPLY packet.
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.
Every 16 ip's

23. Subnetting: What is a /27 in Decimal
255.255.255.224
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
180
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

24. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 16 ip's
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

25. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
IEEE 802.3z
D

26. CABLES: What is the T568B Pinout Standard?
2 hosts
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
IEEE 802.3ab

27. RIP: What Algorithm is used in RIP>
Bellman-Ford
D
180
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.

28. What is Layer 6 in the OSI Model?
Hop Count
Presentation
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
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

29. Name the TCP/IP Layers
60
Pins 1+2 swap places with pins 3+6
(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

30. EIGRP: What packet is used to propagate routing information?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Query and other router responds with a REPLY packet.
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Transport

31. OSPF: how do you change the cost of an interface for OSPF?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Periodic Updates of their routing table

32. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
2 - each port is it's own collision domain
Frames

33. What is the Transport PDU called?
Segments
D
Add the magic number to the network minus 1
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

34. Symbol for EIGRP on a Show ip route
Network
Switch forwards the frame as soon as it can
D
Hop Count

35. Using the magic number how to you figure the broadcast?
Switch forwards frame once it completely receives it
Add the magic number to the network minus 1
/28
Every 32 ip's

36. Subnetting: What is a /16 in Decimal
Shortest path first - (SPF)
R1(config)#router rip - R1(config-router)#version 2
Every 8 ip's
255.255.0.0

37. Switching Methods: What is Cut-through?
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Switch forwards the frame as soon as it can
Pins 1+2 swap places with pins 3+6
Bandwidth - Delay - reliability and Load

38. Subnetting: What is a /18 in Decimal
255.255.192.0
Shortest path first - (SPF)
Closest multiple of the magic number that is not over the interesting octets number.
180 seconds

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

40. Subnetting: What is a 255.128.0.0 in prefix notation
Packets
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
/9
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

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

42. What is the metric for RIP
180
Hop Count
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
Layer 2

43. OSPF: What is the process used by OSPF to build a routing table (step by step)
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
2 - each port is it's own collision domain
100
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

44. IEEE Standards: Ethernet
Presentation
IEEE 802.3
Switch forwards frame once it completely receives it
1 - everything hooked to the hub is in the same collision domain

45. EIGRP: What packet is used to search for networks?
Show ip eigrp topology
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
60
Query and other router responds with a REPLY packet.

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

47. Command for a static route with exit interface
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
/24
Router(config)#ip route {exit-interface}
Session

48. Subnetting: What is a 255.255.255.0 in prefix notation
/24
/9
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Application

49. Symbol for Rip on a Show ip route
R
DCE
/22
255.255.255.224

50. RIP: What is the default Administrative Distance?
R1(config)#router rip - R1(config-router)#version 2
255.255.192.0
120
DUAL: Difusing Update Algorithm