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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. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
Segments
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Frames

2. OSPF: What is the default administrative distance?
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
2 - the bridge separates the collision domain
110
120

3. Name the OSI Layers
62 per network
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Data-Link
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

4. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Periodic Updates of their routing table
Query and other router responds with a REPLY packet.
Shortest path first - (SPF)
30 per network

5. Subnetting: What is a 255.255.255.240 in prefix notation
/28
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Router(config)#ip route {network address} {subnet-mask}
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

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

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

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8. What is Layer 4 in the OSI Model?
Physical
Query and other router responds with a REPLY packet.
Switch forwards frame once it completely receives it
Transport

9. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Presentation
Every 32 ip's
R3(config)#router rip - R3(config-router)#network 192.168.1.2
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

10. OSPF: What Algorithm is used?
Every 8 ip's
Shortest path first - (SPF)
Bandwidth - Delay - reliability and Load
Session

11. What is Layer 7 in the OSI Model?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
126 per network
Closest multiple of the magic number that is not over the interesting octets number.
Application

12. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Session
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
255.255.255.128
2 - each port is it's own collision domain

13. Using the magic number how to you figure the network?
Every 32 ip's
/22
Application
Closest multiple of the magic number that is not over the interesting octets number.

14. Command for a static route with exit interface
255.255.255.252
Segments
Router(config)#ip route {exit-interface}
Every 8 ip's

15. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
255.255.255.252
DCE
R3(config)#router rip - R3(config-router)#network 192.168.1.2
14 per network

16. Subnetting: What is a 255.255.252.0 in prefix notation
60
/22
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
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

17. Switching Methods: What is Fragment-free?
Bellman-Ford
100
Physical
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

18. EIGRP: What is the range of Autonomous System numbers?
Physical
1-65535
Packets
Switch forwards frame once it completely receives it

19. Subnetting: What is a /16 in Decimal
Switch forwards frame once it completely receives it
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)#
Frames
255.255.0.0

20. Rip: Command to prevent rip updates on an interface
IEEE 802.3z
Frames
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
180 seconds

21. What are the commands to setup SSH?
120
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 - each port is it's own collision domain
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

22. Switching Methods: What is Cut-through?
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
Switch forwards the frame as soon as it can
Periodic Updates of their routing table

23. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Query and other router responds with a REPLY packet.
1 - everything hooked to the hub is in the same collision domain
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

24. What is the layer 3 PDU called?
Hop Count
Packets
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Router(config)#ip route {network address} {subnet-mask}

25. What is the layer 4 PDU called?
D
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Segments
255.255.255.128

26. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
Every 32 ip's
Closest multiple of the magic number that is not over the interesting octets number.
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)#

27. Name the TCP/IP Layers
2 hosts
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
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Network

28. How many Collision domains are there on a with 1 hub and 2 computers?
R
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
1 - everything hooked to the hub is in the same collision domain

29. RIP: What is the default Administrative Distance?
2 - each port is it's own collision domain
120
30 per network
255.255.192.0

30. Subnetting: What is a /25 in Decimal
255.255.255.128
Bellman-Ford
255.255.255.224
Physical

31. What gets the clock rate - DCE or DTE?
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)#
DCE
30 per network
Frames

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

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33. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
Data-Link
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Every 16 ip's

34. Rip: What does v2 have that v1 does not?
Every 32 ip's
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Shortest path first - (SPF)

35. What is Layer 3 in the OSI Model?
/28
Network
Transport
120

36. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
Packets
Add the magic number to the network minus 1
/9

37. Rip: What causes a triggered update?
2 - each port is it's own collision domain
100
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
1 - everything hooked to the hub is in the same collision domain

38. EIGRP: What packet is used to propagate routing information?
255.255.0.0
Every 4 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

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

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40. EIGRP: What is the default administrative distance?
Segments
100
Transport
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

41. What is the metric for EIGRP
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Bandwidth - Delay - reliability and Load
Transport

42. 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
DUAL: Difusing Update Algorithm
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

43. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Network
62 per network
Frames
Segments

44. What is the layer 2 PDU called?
Frames
Add the magic number to the network minus 1
Closest multiple of the magic number that is not over the interesting octets number.
Every 32 ip's

45. EIGRP: What packet is used to search for networks?
IEEE 802.3u
Show ip eigrp topology
Query and other router responds with a REPLY packet.
Layer 2

46. What is Layer 5 in the OSI Model?
Session
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

47. What is Layer 6 in the OSI Model?
Bandwidth - Delay - reliability and Load
Presentation
255.255.255.224
Every 16 ip's

48. Rip Timers: How long is the default for Flush timer.
D
Every 128 ip's
60
Bandwidth - Delay - reliability and Load

49. What is Layer 1 in the OSI Model?
Session
Packets
Physical
2 hosts

50. Subnetting: What is a /30 in Decimal
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
255.255.255.252
Session
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.