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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. What is the layer 3 PDU called?
Packets
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
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
100

2. Rip Timers: How long is the default for Holddown timer.
Router(config)#ip route {exit-interface}
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
180
255.255.255.224

3. IEEE Standards: Fast Ethernet
Physical
Every 32 ip's
IEEE 802.3u
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

4. What is the Data-Link PDU called?
DCE
Frames
IEEE 802.3ab
62 per network

5. Subnetting: What is a /18 in Decimal
Query and other router responds with a REPLY packet.
/24
Segments
255.255.192.0

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

7. OSPF: how do you change the cost of an interface for OSPF?
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
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
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 128 ip's

8. IEEE Standards: Gibabit Ethernet (Fibre)
Frames
180
255.255.192.0
IEEE 802.3z

9. EIGRP: What is the range of Autonomous System numbers?
Network
1-65535
Router(config)#ip route {network address} {subnet-mask}
255.255.255.128

10. 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
Application
180 seconds
Router(config)#ip route {exit-interface}

11. What is Layer 7 in the OSI Model?
Application
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
60
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

12. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
Layer 2
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Pins 1+2 swap places with pins 3+6
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

13. CABLES: What is the T568A Pinout Standard?
IEEE 802.3z
Network
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

14. Name the OSI Layers
IEEE 802.3u
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Every 4 ip's

15. Rip: What causes a triggered update?
255.255.255.252
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
R3(config)#router rip - R3(config-router)#network 192.168.1.2
255.255.255.128

16. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
255.255.0.0
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
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

17. What are the comands to set the clock rate in a serial connection?
62 per network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
R3(config)#router rip - R3(config-router)#network 192.168.1.2

18. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
/9
62 per network
14 per network
R3(config)#router rip - R3(config-router)#network 192.168.1.2

19. What gets the clock rate - DCE or DTE?
/22
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
DCE
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

20. RIP: What is the default Administrative Distance?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
120
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Transport

21. Subnetting: What is a /25 in Decimal
255.255.255.128
Layer 2
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Bandwidth - Delay - reliability and Load

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

23. What is the metric for RIP
Hop Count
Bellman-Ford
Network
Periodic Updates of their routing table

24. Switching Methods: What is Store and Forward?
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
Switch forwards frame once it completely receives it
255.255.255.252
1 - everything hooked to the hub is in the same collision domain

25. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
2 hosts
126 per network
Application
60

26. What are the commands to setup SSH?
Every 16 ip's
Add the magic number to the network minus 1
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)#
Every 32 ip's

27. What is Layer 1 in the OSI Model?
Physical
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 802.3u
Periodic Updates of their routing table

28. Subnetting: What is a 255.255.252.0 in prefix notation
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
Session
/22

29. What is Layer 4 in the OSI Model?
Frames
255.255.255.224
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Transport

30. Symbol for EIGRP on a Show ip route
Packets
Session
D
Bandwidth - Delay - reliability and Load

31. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
R
2 hosts
255.255.255.128
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

32. Rip Timers: How long is the default for Flush timer.
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 eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
60
Closest multiple of the magic number that is not over the interesting octets number.

33. OSPF: What does OSPF use for its metric?
14 per network
Segments
IEEE 802.3ab
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

34. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
Session
Every 32 ip's
Frames

35. Command for a static route with exit interface
Presentation
Router(config)#ip route {exit-interface}
100
Session

36. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
30 per network
/9

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

38. CABLES: What is the difference between T568A and T568B?
Closest multiple of the magic number that is not over the interesting octets number.
Hop Count
Bellman-Ford
Pins 1+2 swap places with pins 3+6

39. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Switch forwards the frame as soon as it can
30 per network
Every 128 ip's
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

40. How many Collision domains are there on a with 1 hub and 2 computers?
Every 32 ip's
Query and other router responds with a REPLY packet.
62 per network
1 - everything hooked to the hub is in the same collision domain

41. 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
Router(config)#ip route {network address} {subnet-mask}
62 per network

42. What is the metric for EIGRP
Bandwidth - Delay - reliability and Load
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
120
180

43. What is Layer 2 in the OSI Model?
Every 128 ip's
255.255.255.252
255.255.255.224
Data-Link

44. Using the magic number how to you figure the broadcast?
Packets
Add the magic number to the network minus 1
Layer 2
Physical

45. What Layer does CDP operate at?
Layer 2
IEEE 802.3z
Pins 1+2 swap places with pins 3+6
Bandwidth - Delay - reliability and Load

46. IEEE Standards: Gibabit Ethernet (Copper)
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
Physical
Layer 2
IEEE 802.3ab

47. What is the boot sequence for Cisco Routers?
D
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
126 per network
R1(config)#router rip - R1(config-router)#version 2

48. Symbol for Rip on a Show ip route
R
Periodic Updates of their routing table
1 - everything hooked to the hub is in the same collision domain
255.255.192.0

49. RIP Timers: What is an Flush Timer?
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.
Network
120
IEEE 802.3u

50. Rip: What does v2 have that v1 does not?
DUAL: Difusing Update Algorithm
255.255.255.252
Packets
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization