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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. Using the magic number how to you figure the network?
Show ip eigrp topology
Closest multiple of the magic number that is not over the interesting octets number.
/9
/22

2. What is the layer 3 PDU called?
Packets
IEEE 802.3
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Hop Count

3. What are the comands to set the clock rate in a serial connection?
Layer 2
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
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
30 per network

4. Subnetting: where do the networks break with a /29

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5. EIGRP: How do you view if there are any successor routes?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
110
Show ip eigrp topology
/22

6. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
IEEE 802.3ab
Add the magic number to the network minus 1
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

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

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8. What is the metric for RIP
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Hop Count
Router(config)#ip route {exit-interface}
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

9. RIP Timers: What is an invalid Timer?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Packets
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.
Shortest path first - (SPF)

10. OSPF: What does OSPF use for its metric?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Every 64 ip's
Pins 1+2 swap places with pins 3+6

11. IEEE Standards: Gibabit Ethernet (Copper)
DCE
IEEE 802.3ab
Bandwidth - Delay - reliability and Load
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

12. How do you find the magic number for subnetting?
/24
Every 32 ip's
Bandwidth - Delay - reliability and Load
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

13. Symbol for EIGRP on a Show ip route
D
Switch forwards frame once it completely receives it
Application
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

14. IEEE Standards: Fast Ethernet
Every 8 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)#
IEEE 802.3u
Shortest path first - (SPF)

15. What is the Network PDU called?
Packets
Presentation
DCE
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

16. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
126 per network
2 - the bridge separates the collision domain
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Bellman-Ford

17. Subnetting: What is a /18 in Decimal
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
255.255.192.0
D
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

18. Subnetting: What is a 255.128.0.0 in prefix notation
D
R
/9
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

19. 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
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
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
Frames

20. What is the Transport PDU called?
Segments
60
Hop Count
Frames

21. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
126 per network
255.255.255.224
14 per network
Router(config)#ip route {exit-interface}

22. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
2 - each port is it's own collision domain
R
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

23. Rip Timers: How long is the default for Flush timer.
Hop Count
255.255.255.128
Show ip eigrp topology
60

24. Rip: What causes a triggered update?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
1 - everything hooked to the hub is in the same collision domain
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

25. RIP: What Algorithm is used in RIP>
Bellman-Ford
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
255.255.255.128
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.

26. 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
14 per network
IEEE 802.3ab
Session

27. IEEE Standards: Gibabit Ethernet (Fibre)
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
IEEE 802.3z
DCE
255.255.0.0

28. EIGRP: What is the range of Autonomous System numbers?
Segments
1-65535
2 - each port is it's own collision domain
Hop Count

29. Name the OSI Layers
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
IEEE 802.3z
100
180 seconds

30. What is Layer 4 in the OSI Model?
R
Every 32 ip's
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.
Transport

31. 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.
2 - the bridge separates the collision domain
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
/9

32. Symbol for Rip on a Show ip route
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)#
R
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
255.255.0.0

33. What is Layer 5 in the OSI Model?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Session
255.255.192.0
Pins 1+2 swap places with pins 3+6

34. What is Layer 3 in the OSI Model?
255.255.255.128
Every 8 ip's
Network
Bandwidth - Delay - reliability and Load

35. RIP: What is the default Administrative Distance?
Every 4 ip's
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
D
120

36. Rip Timers: How long is the default for Holddown timer.
180
R1(config)#router rip - R1(config-router)#version 2
1-65535
Frames

37. Rip and EIGRP use what to keep other routers aware of their status?
Layer 2
Periodic Updates of their routing table
/9
2 - each port is it's own collision domain

38. EIGRP: What packet is used to search for networks?
Closest multiple of the magic number that is not over the interesting octets number.
IEEE 802.3
Bandwidth - Delay - reliability and Load
Query and other router responds with a REPLY packet.

39. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
Every 16 ip's
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

40. Subnetting: What is a 255.255.255.240 in prefix notation
/28
255.255.192.0
Shortest path first - (SPF)
Every 16 ip's

41. Name the TCP/IP Layers
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
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
Periodic Updates of their routing table

42. OSPF: What is the process used by OSPF to build a routing table (step by step)
R1(config)#router rip - R1(config-router)#version 2
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Switch forwards frame once it completely receives it
1-65535

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

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44. Switching Methods: What is Fragment-free?
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 frame after receiving the 1st 64bytes to insure no errors.
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Router(config)#ip route {network address} {subnet-mask}

45. What is the metric for EIGRP
Bandwidth - Delay - reliability and Load
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.
Bellman-Ford
Periodic Updates of their routing table

46. RIP Timers: What is an Holddown Timer?
Network
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
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

47. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
Every 4 ip's
1-65535
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

48. Switching Methods: What is Cut-through?
Switch forwards the frame as soon as it can
/28
30 per network
Network

49. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
Router(config)#ip route {exit-interface}
Session
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

50. Subnetting: What is a 255.255.255.0 in prefix notation
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
110
/24
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