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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 default administrative distance?
Every 32 ip's
255.255.255.224
255.255.255.128
100

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

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3. Command for a static route with exit interface
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Router(config)#ip route {exit-interface}
60
Every 64 ip's

4. Subnetting: What is a /30 in Decimal
255.255.255.252
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
R3(config)#router rip - R3(config-router)#network 192.168.1.2
30 per network

5. RIP: What Algorithm is used in RIP>
Every 16 ip's
Bellman-Ford
Add the magic number to the network minus 1
62 per network

6. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
1 - everything hooked to the hub is in the same collision domain
Every 32 ip's
62 per network
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)#

7. How many Collision domains are there on a with 1 hub and 2 computers?
Router(config)#ip route {exit-interface}
1 - everything hooked to the hub is in the same collision domain
Add the magic number to the network minus 1
R

8. EIGRP: What packet is used to propagate routing information?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Segments
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
62 per network

9. What is Layer 4 in the OSI Model?
Transport
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
255.255.255.252

10. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Shortest path first - (SPF)
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
Every 4 ip's

11. What gets the clock rate - DCE or DTE?
DCE
1-65535
2 hosts
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

12. EIGRP: What is the name of the algorithm used for EIGRP?
110
Frames
DUAL: Difusing Update Algorithm
Application

13. What is the layer 3 PDU called?
Packets
Periodic Updates of their routing table
Shortest path first - (SPF)
255.255.255.224

14. Rip Timers: How long is the default for Holddown timer.
180
255.255.192.0
Transport
255.255.255.128

15. What is the metric for EIGRP
Every 16 ip's
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
2 hosts
Bandwidth - Delay - reliability and Load

16. What is the layer 4 PDU called?
Shortest path first - (SPF)
Segments
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)#
Show ip eigrp topology

17. EIGRP: How do you view if there are any successor routes?
Pins 1+2 swap places with pins 3+6
Show ip eigrp topology
255.255.255.252
Closest multiple of the magic number that is not over the interesting octets number.

18. RIP Timers: What is an invalid Timer?
110
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
100
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.

19. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
Show ip eigrp topology
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Router(config)#ip route {exit-interface}

20. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
R
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
R3(config)#router rip - R3(config-router)#network 192.168.1.2

21. OSPF: What is the default administrative distance?
Every 16 ip's
Layer 2
110
Segments

22. Name the TCP/IP Layers
Segments
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
255.255.255.128
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

23. OSPF: What Algorithm is used?
Switch forwards the frame as soon as it can
Switch forwards frame once it completely receives it
Add the magic number to the network minus 1
Shortest path first - (SPF)

24. IEEE Standards: Gibabit Ethernet (Copper)
Periodic Updates of their routing table
Frames
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 802.3ab

25. Subnetting: What is a /18 in Decimal
Hop Count
DCE
IEEE 802.3
255.255.192.0

26. What is the Transport PDU called?
1 - everything hooked to the hub is in the same collision domain
Segments
Data-Link
Router(config)#ip route {network address} {subnet-mask}

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

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28. CABLES: What is the T568B Pinout Standard?
Router(config)#ip route {network address} {subnet-mask}
100
Query and other router responds with a REPLY packet.
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

29. RIP: What is the default Administrative Distance?
120
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Show ip eigrp topology
Router(config)#ip route {exit-interface}

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

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31. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Every 64 ip's
1 - everything hooked to the hub is in the same collision domain
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
30 per network

32. IEEE Standards: Fast Ethernet
IEEE 802.3u
Layer 2
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.
Router(config)#ip route {exit-interface}

33. 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
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
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
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

34. What is the boot sequence for Cisco Routers?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Bandwidth - Delay - reliability and Load
IEEE 802.3z
255.255.255.224

35. Command for a static route with 'Next Hop' Address
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}
Switch forwards frame once it completely receives it
/28

36. RIP Timers: What is an Flush Timer?
Transport
14 per network
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.
Physical

37. IEEE Standards: Gibabit Ethernet (Fibre)
IEEE 802.3z
Data-Link
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

38. Rip Timers: How long is the default for Invalid timer.
255.255.0.0
180 seconds
Switch forwards the frame as soon as it can
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

39. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
Closest multiple of the magic number that is not over the interesting octets number.
126 per network
Application

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

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41. Rip Timers: How long is the default for Flush timer.
IEEE 802.3ab
60
D
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.

42. Switching Methods: What is Store and Forward?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Every 64 ip's
Switch forwards frame once it completely receives it
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.

43. IEEE Standards: Ethernet
Hop Count
IEEE 802.3
D
Bandwidth - Delay - reliability and Load

44. What Layer does CDP operate at?
Network
Show ip eigrp topology
Layer 2
255.255.255.128

45. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
Every 32 ip's
Frames
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

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

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47. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Transport
Every 128 ip's
Segments

48. What is Layer 1 in the OSI Model?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Physical
Bellman-Ford
Frames

49. Subnetting: What is a /25 in Decimal
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Hop Count
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)#
255.255.255.128

50. What is the layer 2 PDU called?
126 per network
2 hosts
Frames
Bellman-Ford