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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. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
IEEE 802.3ab
IEEE 802.3z
2 - the bridge separates the collision domain
Bandwidth - Delay - reliability and Load

2. OSPF: What is the default administrative distance?
30 per network
110
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK 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

3. What are the comands to set the clock rate in a serial connection?
Pins 1+2 swap places with pins 3+6
/28
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

4. What Layer does CDP operate at?
Layer 2
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Closest multiple of the magic number that is not over the interesting octets number.
Segments

5. Symbol for Rip on a Show ip route
R
126 per network
Transport
Frames

6. What is the Transport PDU called?
Hop Count
IEEE 802.3u
Router(config)#ip route {network address} {subnet-mask}
Segments

7. Command for a static route with 'Next Hop' Address
Switch forwards frame once it completely receives it
Router(config)#ip route {network address} {subnet-mask}
Network
255.255.255.224

8. RIP: What Algorithm is used in RIP>
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1 - everything hooked to the hub is in the same collision domain
Bellman-Ford
Bandwidth - Delay - reliability and Load

9. Rip Timers: How long is the default for Flush timer.
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
126 per network
60
255.255.192.0

10. EIGRP: What is the default administrative distance?
Transport
100
Session
/28

11. OSPF: What Algorithm is used?
Transport
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)#
Shortest path first - (SPF)
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

12. What is the metric for EIGRP
62 per network
Add the magic number to the network minus 1
Bandwidth - Delay - reliability and Load
IEEE 802.3z

13. What is Layer 2 in the OSI Model?
Data-Link
255.255.0.0
Pins 1+2 swap places with pins 3+6
Every 4 ip's

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

15. Switching Methods: What is Fragment-free?
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.
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Every 4 ip's

16. Name the OSI Layers
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
Every 4 ip's
255.255.0.0
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

17. 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)#ip route {exit-interface}
IEEE 802.3ab
/9

18. Subnetting: What is a 255.255.255.0 in prefix notation
/24
Query and other router responds with a REPLY packet.
100
120

19. Command for a static route with exit interface
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Router(config)#ip route {exit-interface}
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
/9

20. What is Layer 4 in the OSI Model?
2 - each port is it's own collision domain
1-65535
Transport
Every 64 ip's

21. EIGRP: What packet is used to search for networks?
Segments
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.
Query and other router responds with a REPLY packet.
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

22. What are the commands to setup SSH?
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)#
Add the magic number to the network minus 1
255.255.255.252
R

23. What is Layer 5 in the OSI Model?
110
R
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Session

24. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
120
Bellman-Ford
Hop Count

25. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Transport
30 per network
180 seconds
/24

26. What gets the clock rate - DCE or DTE?
DCE
180 seconds
Every 4 ip's
Segments

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

28. Using the magic number how to you figure the network?
180 seconds
126 per network
Every 32 ip's
Closest multiple of the magic number that is not over the interesting octets number.

29. Rip Timers: How long is the default for Invalid timer.
Network
62 per network
255.255.192.0
180 seconds

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

31. Rip: What does v2 have that v1 does not?
Physical
/9
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
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

32. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
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
14 per network
Add the magic number to the network minus 1
110

33. What is the layer 2 PDU called?
Frames
126 per network
1 - everything hooked to the hub is in the same collision domain
/22

34. Rip: how do hold down timers work?
62 per network
2 hosts
Closest multiple of the magic number that is not over the interesting octets number.
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

35. CABLES: What is the T568A Pinout Standard?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
2 hosts
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

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

37. RIP Timers: What is an Holddown Timer?
Bellman-Ford
110
Session
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

38. IEEE Standards: Gibabit Ethernet (Copper)
Pins 1+2 swap places with pins 3+6
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 802.3ab
D

39. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
Data-Link
D
255.255.255.128

40. What is the boot sequence for Cisco Routers?
/28
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Frames
126 per network

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

42. Symbol for EIGRP on a Show ip route
D
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Frames
Every 8 ip's

43. CABLES: What is the difference between T568A and T568B?
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.
Pins 1+2 swap places with pins 3+6
Transport
Every 8 ip's

44. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Every 64 ip's
Application
126 per network
Periodic Updates of their routing table

45. RIP: What is the default Administrative Distance?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 64 ip's
120
Every 128 ip's

46. RIP Timers: What is an Flush Timer?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Hop Count
Frames
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.

47. IEEE Standards: Ethernet
IEEE 802.3
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
62 per network
Data-Link

48. Rip: What causes a triggered update?
Bellman-Ford
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
255.255.255.224
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

49. EIGRP: What packet is used to propagate routing information?
120
1 - everything hooked to the hub is in the same collision domain
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
DCE

50. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
IEEE 802.3u
2 hosts
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
14 per network