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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. 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
60
R1(config)#router rip - R1(config-router)#version 2
Application

2. What is Layer 4 in the OSI Model?
255.255.255.224
Every 4 ip's
Transport
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

3. Rip Timers: How long is the default for Holddown timer.
Shortest path first - (SPF)
180
Data-Link
2 hosts

4. What is the Data-Link PDU called?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Frames
Add the magic number to the network minus 1
Every 4 ip's

5. OSPF: What is the process used by OSPF to build a routing table (step by step)
255.255.192.0
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
DUAL: Difusing Update Algorithm
60

6. IEEE Standards: Ethernet
/28
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
IEEE 802.3
Switch forwards the frame as soon as it can

7. What is the layer 4 PDU called?
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
Segments
Every 32 ip's
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

8. 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.
Bellman-Ford
2 - the bridge separates the collision domain

9. Rip Timers: How long is the default for Invalid timer.
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 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
2 hosts
180 seconds

10. EIGRP: What is the hello packet used for?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Bandwidth - Delay - reliability and Load
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
2 - the bridge separates the collision domain

11. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
255.255.255.252
Network
Periodic Updates of their routing table
30 per network

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

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13. EIGRP: What packet is used to search for networks?
Frames
Periodic Updates of their routing table
1-65535
Query and other router responds with a REPLY packet.

14. What is the layer 2 PDU called?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
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
Frames

15. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
DUAL: Difusing Update Algorithm
30 per network
Closest multiple of the magic number that is not over the interesting octets number.

16. How do you find the magic number for subnetting?
Shortest path first - (SPF)
Every 16 ip's
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
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.

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

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18. IEEE Standards: Gibabit Ethernet (Copper)
Bellman-Ford
255.255.0.0
IEEE 802.3ab
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

19. Subnetting: What is a /25 in Decimal
180
Show ip eigrp topology
255.255.255.128
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)#

20. Switching Methods: What is Store and Forward?
180
110
Every 16 ip's
Switch forwards frame once it completely receives it

21. Symbol for Rip on a Show ip route
IEEE 802.3
100
R
Closest multiple of the magic number that is not over the interesting octets number.

22. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Every 64 ip's
Data-Link
2 - the bridge separates the collision domain

23. What is the Transport PDU called?
Segments
180 seconds
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Every 4 ip's

24. What is Layer 7 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
Every 16 ip's
Application
DCE

25. What gets the clock rate - DCE or DTE?
DCE
2 - each port is it's own collision domain
Every 8 ip's
R

26. What is Layer 3 in the OSI Model?
Network
126 per network
180 seconds
Shortest path first - (SPF)

27. Using the magic number how to you figure the broadcast?
Physical
255.255.192.0
Add the magic number to the network minus 1
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

28. RIP Timers: What is an invalid Timer?
180
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
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.
1-65535

29. EIGRP: What packet is used to propagate routing information?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
2 - each port is it's own collision domain
Packets
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

30. OSPF: What Algorithm is used?
120
2 - each port is it's own collision domain
Shortest path first - (SPF)
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

31. Command for a static route with exit interface
Presentation
Router(config)#ip route {exit-interface}
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.
Session

32. What are the commands to setup SSH?
30 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)#
255.255.255.128
Presentation

33. IEEE Standards: Fast Ethernet
30 per network
62 per network
IEEE 802.3u
14 per network

34. How many Collision domains are there on a with 1 hub and 2 computers?
1 - everything hooked to the hub is in the same collision domain
110
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Query and other router responds with a REPLY packet.

35. Using the magic number how to you figure the network?
Frames
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
IEEE 802.3z
Closest multiple of the magic number that is not over the interesting octets number.

36. What is Layer 1 in the OSI Model?
Segments
1 - everything hooked to the hub is in the same collision domain
Physical
R

37. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
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
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
DCE
1-65535

38. What is the Network PDU called?
2 - the bridge separates the collision domain
Packets
Periodic Updates of their routing table
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

39. 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.
D
Network
Bellman-Ford

40. Subnetting: What is a 255.128.0.0 in prefix notation
126 per network
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
/9

41. What is the layer 3 PDU called?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
14 per network
Packets
IEEE 802.3u

42. IEEE Standards: Gibabit Ethernet (Fibre)
255.255.192.0
IEEE 802.3z
255.255.255.252
Router(config)#ip route {exit-interface}

43. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
2 hosts
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

44. Subnetting: What is a /16 in Decimal
255.255.0.0
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
Packets
255.255.255.128

45. RIP Timers: What is an Holddown Timer?
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
180 seconds
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Layer 2

46. RIP Timers: What is an Flush Timer?
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.
1-65535
Packets
Packets

47. What is the boot sequence for Cisco Routers?
/9
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. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

48. Subnetting: What is a 255.255.252.0 in prefix notation
Query and other router responds with a REPLY packet.
/22
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

49. RIP: What Algorithm is used in RIP>
126 per network
Bellman-Ford
Data-Link
255.255.255.224

50. EIGRP: How do you view if there are any successor routes?
R
2 - each port is it's own collision domain
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Show ip eigrp topology