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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. IEEE Standards: Ethernet
60
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
IEEE 802.3
Physical

2. Symbol for EIGRP on a Show ip route
DCE
D
Show ip eigrp topology
14 per network

3. CABLES: What is the T568B Pinout Standard?
Periodic Updates of their routing table
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
255.255.255.224
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

4. What is Layer 3 in the OSI Model?
2 - the bridge separates the collision domain
Router(config)#ip route {exit-interface}
14 per network
Network

5. EIGRP: What packet is used to search for networks?
Closest multiple of the magic number that is not over the interesting octets number.
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Query and other router responds with a REPLY packet.
Every 128 ip's

6. What is the boot sequence for Cisco Routers?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
1 - everything hooked to the hub is in the same collision domain
Add the magic number to the network minus 1

7. EIGRP: How do you view if there are any successor routes?
Show ip eigrp topology
Periodic Updates of their routing table
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

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

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9. What is the layer 3 PDU called?
126 per network
Packets
R3(config)#router rip - R3(config-router)#network 192.168.1.2
IEEE 802.3z

10. Subnetting: What is a /27 in Decimal
255.255.0.0
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Layer 2
255.255.255.224

11. Switching Methods: What is Cut-through?
126 per network
255.255.255.252
Switch forwards frame once it completely receives it
Switch forwards the frame as soon as it can

12. Rip Timers: How long is the default for Flush timer.
Bandwidth - Delay - reliability and Load
60
Pins 1+2 swap places with pins 3+6
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

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

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14. Command for a static route with exit interface
Router(config)#ip route {exit-interface}
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Router(config)#ip route {network address} {subnet-mask}
DCE

15. What are the commands to setup SSH?
Every 64 ip's
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)#
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
IEEE 802.3z

16. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
100
Show ip eigrp topology
62 per network

17. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Every 16 ip's
2 - the bridge separates the collision domain
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

18. RIP: What Algorithm is used in RIP>
Bellman-Ford
Every 32 ip's
Every 4 ip's
30 per network

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

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20. What is the metric for EIGRP
Bandwidth - Delay - reliability and Load
Router(config)#ip route {exit-interface}
120
2 - the bridge separates the collision domain

21. Subnetting: What is a /18 in Decimal
IEEE 802.3u
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
Every 16 ip's
255.255.192.0

22. 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.
Every 8 ip's
126 per network
Frames

23. 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
Application
R1(config)#router rip - R1(config-router)#version 2
Bandwidth - Delay - reliability and Load

24. 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.
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Every 128 ip's
62 per network

25. EIGRP: What is the default administrative distance?
Pins 1+2 swap places with pins 3+6
Bellman-Ford
100
Network

26. 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
IEEE 802.3z
R3(config)#router rip - R3(config-router)#network 192.168.1.2
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

27. What gets the clock rate - DCE or DTE?
Query and other router responds with a REPLY packet.
Periodic Updates of their routing table
D
DCE

28. What is the metric for RIP
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Bellman-Ford
Hop Count

29. Name the OSI Layers
Every 4 ip's
Pins 1+2 swap places with pins 3+6
Presentation
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

30. Rip Timers: How long is the default for Invalid timer.
100
IEEE 802.3z
1 - everything hooked to the hub is in the same collision domain
180 seconds

31. What is the Network PDU called?
Packets
Add the magic number to the network minus 1
255.255.0.0
180

32. EIGRP: What is the name of the algorithm used for EIGRP?
100
DUAL: Difusing Update Algorithm
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Every 8 ip's

33. Rip and EIGRP use what to keep other routers aware of their status?
Switch forwards the frame as soon as it can
Periodic Updates of their routing table
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

34. Subnetting: What is a /25 in Decimal
255.255.255.128
R
DUAL: Difusing Update Algorithm
30 per network

35. Using the magic number how to you figure the broadcast?
Query and other router responds with a REPLY packet.
/28
Add the magic number to the network minus 1
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

36. What are the comands to set the clock rate in a serial connection?
Hop Count
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
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.

37. What is Layer 4 in the OSI Model?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
IEEE 802.3u
Transport
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.

38. Command for a static route with 'Next Hop' Address
/24
R1(config)#router rip - R1(config-router)#version 2
Router(config)#ip route {network address} {subnet-mask}
R

39. 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
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)#
Switch forwards the frame as soon as it can
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

40. RIP Timers: What is an invalid Timer?
Transport
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
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.
Network

41. Symbol for Rip on a Show ip route
R
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 128 ip's
DCE

42. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
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)#
2 hosts
100
Application

43. Rip Timers: How long is the default for Holddown timer.
180
Physical
Switch forwards the frame as soon as it can
Data-Link

44. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
30 per network
Every 64 ip's
IEEE 802.3u

45. What is Layer 1 in the OSI Model?
1-65535
Physical
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Switch forwards the frame as soon as it can

46. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
255.255.255.128
Packets
126 per network
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

47. IEEE Standards: Fast Ethernet
IEEE 802.3u
Data-Link
Session
180

48. OSPF: What Algorithm is used?
Shortest path first - (SPF)
Every 128 ip's
110
255.255.255.252

49. OSPF: What is the default administrative distance?
110
62 per network
R1(config)#router rip - R1(config-router)#version 2
Show ip eigrp topology

50. What is the layer 2 PDU called?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Add the magic number to the network minus 1
Packets
Frames