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CCENT

Instructions:

Answer 50 questions in 15 minutes.
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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. Symbol for EIGRP on a Show ip route
Query and other router responds with a REPLY packet.
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
D
Every 128 ip's

2. OSPF: What is the process used by OSPF to build a routing table (step by step)
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
100
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

3. What is Layer 4 in the OSI Model?
DCE
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
30 per network
Transport

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

5. CABLES: What is the T568A Pinout Standard?
Bandwidth - Delay - reliability and Load
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
2 - the bridge separates the collision domain

6. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
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
Switch forwards the frame as soon as it can

7. What is Layer 7 in the OSI Model?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
D
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
Application

8. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
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
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
110

9. What is the Transport PDU called?
255.255.0.0
30 per network
Segments
Closest multiple of the magic number that is not over the interesting octets number.

10. Switching Methods: What is Cut-through?
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)#
1 - everything hooked to the hub is in the same collision domain
Switch forwards the frame as soon as it can
120

11. What is Layer 5 in the OSI Model?
Session
Segments
Show ip eigrp topology
Router(config)#ip route {network address} {subnet-mask}

12. Subnetting: What is a /25 in Decimal
Add the magic number to the network minus 1
255.255.255.128
62 per network
Hop Count

13. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Segments
Bellman-Ford
Closest multiple of the magic number that is not over the interesting octets number.

14. What is the layer 4 PDU called?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Segments
60
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

15. Switching Methods: What is Fragment-free?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
14 per network
Physical
DUAL: Difusing Update Algorithm

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

17. Name the OSI Layers
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
1-65535
Router(config)#ip route {exit-interface}
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

18. EIGRP: How do you view if there are any successor routes?
Hop Count
Show ip eigrp topology
IEEE 802.3
Transport

19. Subnetting: What is a 255.128.0.0 in prefix notation
IEEE 802.3z
/9
255.255.0.0
IEEE 802.3ab

20. CABLES: What is the difference between T568A and T568B?
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)#
14 per network
Pins 1+2 swap places with pins 3+6
Segments

21. Subnetting: What is a 255.255.255.240 in prefix notation
Query and other router responds with a REPLY packet.
/28
Segments
1-65535

22. Rip: how do hold down timers work?
Every 64 ip's
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
255.255.192.0
Every 8 ip's

23. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
14 per network
Presentation
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

24. What are the comands to set the clock rate in a serial connection?
IEEE 802.3
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Segments
120

25. EIGRP: What packet is used to search for networks?
IEEE 802.3
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Query and other router responds with a REPLY packet.

26. RIP: What Algorithm is used in RIP>
Application
Frames
Bellman-Ford
/24

27. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Bellman-Ford
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

28. OSPF: What Algorithm is used?
/9
Network
Shortest path first - (SPF)
Every 16 ip's

29. What is the boot sequence for Cisco Routers?
60
Frames
Segments
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

30. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
IEEE 802.3z
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Every 16 ip's

31. OSPF: What does OSPF use for its metric?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

32. What is Layer 1 in the OSI Model?
Show ip eigrp topology
Physical
2 - the bridge separates the collision domain
Session

33. What Layer does CDP operate at?
Network
Layer 2
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

34. How do you find the magic number for subnetting?
1 - everything hooked to the hub is in the same collision domain
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
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Every 16 ip's

35. What is the metric for EIGRP
Bandwidth - Delay - reliability and Load
Every 128 ip's
/24
Hop Count

36. Rip: What does v2 have that v1 does not?
/9
Shortest path first - (SPF)
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

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

38. What is the layer 3 PDU called?
/22
1-65535
Packets
Every 128 ip's

39. Rip Timers: How long is the default for Invalid timer.
R1(config)#router rip - R1(config-router)#version 2
Shortest path first - (SPF)
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

40. IEEE Standards: Fast Ethernet
Switch forwards the frame as soon as it can
IEEE 802.3u
Every 32 ip's
Frames

41. IEEE Standards: Ethernet
Every 32 ip's
IEEE 802.3
/9
R1(config)#router rip - R1(config-router)#version 2

42. Switching Methods: What is Store and Forward?
/9
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Switch forwards frame once it completely receives it
180

43. Rip and EIGRP use what to keep other routers aware of their status?
255.255.192.0
Bandwidth - Delay - reliability and Load
Periodic Updates of their routing table
Frames

44. What are the commands to setup SSH?
Router(config)#ip route {exit-interface}
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)#
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.

45. CABLES: What is the T568B Pinout Standard?
Transport
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Every 32 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

46. What is Layer 6 in the OSI Model?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Closest multiple of the magic number that is not over the interesting octets number.
Bellman-Ford
Presentation

47. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
/24
126 per network
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
IEEE 802.3z

48. Rip: Command to prevent rip updates on an interface
Router(config)#ip route {exit-interface}
Session
Segments
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

49. What is the layer 2 PDU called?
Application
Switch forwards frame once it completely receives it
Frames
IEEE 802.3

50. OSPF: What is the default administrative distance?
180
14 per network
110
Packets