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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: What is the default administrative distance?
Frames
Physical
110
Every 32 ip's

2. What is Layer 1 in the OSI Model?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Every 16 ip's
Physical
255.255.255.128

3. Subnetting: What is a /18 in Decimal
180 seconds
Network
255.255.192.0
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

4. OSPF: What does OSPF use for its metric?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Packets
2 - each port is it's own collision domain
60

5. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Every 64 ip's
30 per network
126 per network
Every 4 ip's

6. RIP: What is the default Administrative Distance?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
120
IEEE 802.3u
IEEE 802.3ab

7. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
Bandwidth - Delay - reliability and Load
60
Segments

8. EIGRP: How do you view if there are any successor routes?
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
Show ip eigrp topology
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

9. RIP Timers: What is an Holddown Timer?
1-65535
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
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
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

10. What is the metric for RIP
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Add the magic number to the network minus 1
120
Hop Count

11. 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)#
IEEE 802.3u
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

12. IEEE Standards: Gibabit Ethernet (Fibre)
2 - the bridge separates the collision domain
IEEE 802.3z
Frames
255.255.255.128

13. What is Layer 2 in the OSI Model?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Data-Link
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Application

14. Name the OSI Layers
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Every 32 ip's
2 - each port is it's own collision domain
62 per network

15. CABLES: What is the T568B Pinout Standard?
Session
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Physical
Network

16. What is Layer 6 in the OSI Model?
IEEE 802.3u
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
Presentation

17. What Layer does CDP operate at?
14 per network
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Hop Count
Layer 2

18. What are the commands to setup SSH?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
255.255.0.0
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)#
62 per network

19. Subnetting: What is a 255.255.255.240 in prefix notation
255.255.0.0
/28
14 per network
Router(config)#ip route {exit-interface}

20. IEEE Standards: Gibabit Ethernet (Copper)
Packets
IEEE 802.3ab
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

21. Name the TCP/IP Layers
/22
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
180
255.255.255.224

22. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
R1(config)#router rip - R1(config-router)#version 2
255.255.255.252
Show ip eigrp topology

23. Subnetting: What is a /25 in Decimal
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
255.255.255.128
Every 4 ip's
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

24. Symbol for Rip on a Show ip route
62 per network
Network
R
30 per network

25. Rip: how do hold down timers work?
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
126 per network
Bandwidth - Delay - reliability and Load
Every 8 ip's

26. Rip: What does v2 have that v1 does not?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Packets

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

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28. What is the Transport PDU called?
Network
Show ip eigrp topology
30 per network
Segments

29. What is the Network PDU called?
255.255.192.0
Packets
2 - the bridge separates the collision domain
100

30. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
255.255.192.0
2 - the bridge separates the collision domain
2 hosts
/28

31. EIGRP: What is the hello packet used for?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
255.255.255.128
/9
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

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

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33. Rip: What causes a triggered update?
Layer 2
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Router(config)#ip route {network address} {subnet-mask}
IEEE 802.3ab

34. EIGRP: What packet is used to search for networks?
Query and other router responds with a REPLY packet.
Session
Packets
Transport

35. What is the boot sequence for Cisco Routers?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
1-65535
120
255.255.192.0

36. What is the layer 2 PDU called?
Frames
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
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.
Packets

37. 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
DUAL: Difusing Update Algorithm
2 - the bridge separates the collision domain
Segments

38. OSPF: What Algorithm is used?
Shortest path first - (SPF)
Every 8 ip's
Bellman-Ford
Packets

39. RIP Timers: What is an invalid Timer?
D
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
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.
IEEE 802.3

40. What is Layer 7 in the OSI Model?
Session
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.
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
Application

41. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
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 32 ip's
Every 4 ip's
62 per network

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

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43. Subnetting: What is a 255.255.255.0 in prefix notation
126 per network
180 seconds
Frames
/24

44. OSPF: What is the process used by OSPF to build a routing table (step by step)
Bellman-Ford
Closest multiple of the magic number that is not over the interesting octets number.
Query and other router responds with a REPLY packet.
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

45. What is the layer 4 PDU called?
IEEE 802.3u
Segments
R1(config)#router rip - R1(config-router)#version 2
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

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

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47. IEEE Standards: Ethernet
Physical
IEEE 802.3
IEEE 802.3z
Application

48. What are the comands to set the clock rate in a serial connection?
IEEE 802.3ab
/24
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Show ip eigrp topology

49. Subnetting: What is a /30 in Decimal
/22
R1(config)#router rip - R1(config-router)#version 2
D
255.255.255.252

50. What is Layer 5 in the OSI Model?
Session
R
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Segments