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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. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
1-65535
Packets
Periodic Updates of their routing table

2. Using the magic number how to you figure the network?
Router(config)#ip route {network address} {subnet-mask}
1 - everything hooked to the hub is in the same collision domain
Closest multiple of the magic number that is not over the interesting octets number.
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

3. Name the TCP/IP Layers
Switch forwards frame once it completely receives it
Hop Count
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
DUAL: Difusing Update Algorithm

4. What is the Data-Link PDU called?
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
IEEE 802.3z
/28
Frames

5. Switching Methods: What is Store and Forward?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Every 4 ip's
Switch forwards frame once it completely receives it
IEEE 802.3u

6. Rip Timers: How long is the default for Invalid timer.
255.255.255.224
Packets
180 seconds
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

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

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

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9. Switching Methods: What is Cut-through?
Every 64 ip's
62 per network
14 per network
Switch forwards the frame as soon as it can

10. CABLES: What is the T568A Pinout Standard?
126 per network
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
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.
255.255.192.0

11. Rip: What is the command to enable Ripv2?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
255.255.255.128
Every 4 ip's
R1(config)#router rip - R1(config-router)#version 2

12. EIGRP: What is the hello packet used for?
1-65535
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)#
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Data-Link

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

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14. RIP: What Algorithm is used in RIP>
R1(config)#router rip - R1(config-router)#version 2
Bellman-Ford
/9
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

15. What is the metric for EIGRP
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Every 4 ip's
126 per network
Bandwidth - Delay - reliability and Load

16. What is Layer 7 in the OSI Model?
Application
IEEE 802.3u
Every 8 ip's
Shortest path first - (SPF)

17. What is the layer 4 PDU called?
Bandwidth - Delay - reliability and Load
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Segments
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

18. What is the Transport PDU called?
Segments
D
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
Session

19. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Bellman-Ford
2 hosts
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)#

20. What is Layer 3 in the OSI Model?
Shortest path first - (SPF)
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Network
Every 64 ip's

21. Switching Methods: What is Fragment-free?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Physical
Session
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

22. EIGRP: What packet is used to propagate routing information?
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
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
DCE
Every 8 ip's

23. OSPF: how do you change the cost of an interface for OSPF?
Every 16 ip's
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
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)#

24. EIGRP: What is the name of the algorithm used for EIGRP?
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
Session
DUAL: Difusing Update Algorithm
D

25. Rip: What causes a triggered update?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
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)#
Router(config)#ip route {network address} {subnet-mask}

26. What is Layer 6 in the OSI Model?
Presentation
Bellman-Ford
IEEE 802.3u
Frames

27. Name the OSI Layers
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Bellman-Ford
14 per network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

28. Command for a static route with exit interface
Bandwidth - Delay - reliability and Load
60
Router(config)#ip route {exit-interface}
Presentation

29. 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
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.
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
DCE

30. Subnetting: What is a /27 in Decimal
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Periodic Updates of their routing table
2 - the bridge separates the collision domain
255.255.255.224

31. Subnetting: What is a 255.128.0.0 in prefix notation
30 per network
/9
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
180

32. What is Layer 5 in the OSI Model?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
2 - each port is it's own collision domain
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Session

33. OSPF: What is the default administrative distance?
110
DCE
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

34. OSPF: What Algorithm is used?
180
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Shortest path first - (SPF)
100

35. Subnetting: What is a 255.255.255.0 in prefix notation
Every 64 ip's
Query and other router responds with a REPLY packet.
/24
14 per network

36. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
62 per network
Network
126 per network
Pins 1+2 swap places with pins 3+6

37. What are the comands to set the clock rate in a serial connection?
Transport
Shortest path first - (SPF)
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
120

38. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
2 - the bridge separates the collision domain
IEEE 802.3z
Every 32 ip's
DCE

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

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

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41. Rip: What does v2 have that v1 does not?
Query and other router responds with a REPLY packet.
1-65535
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Transport

42. IEEE Standards: Gibabit Ethernet (Fibre)
Hop Count
Network
30 per network
IEEE 802.3z

43. IEEE Standards: Ethernet
Layer 2
100
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.
IEEE 802.3

44. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
126 per network
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Packets
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

45. Rip Timers: How long is the default for Holddown timer.
100
Session
Query and other router responds with a REPLY packet.
180

46. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Router(config)#ip route {network address} {subnet-mask}
180 seconds
62 per network
/9

47. IEEE Standards: Gibabit Ethernet (Copper)
2 hosts
IEEE 802.3u
IEEE 802.3ab
Router(config)#ip route {exit-interface}

48. CABLES: What is the difference between T568A and T568B?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Pins 1+2 swap places with pins 3+6
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

49. RIP Timers: What is an Holddown Timer?
Layer 2
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
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

50. RIP: What is the default Administrative Distance?
120
Every 32 ip's
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.
Segments