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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. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
2 - the bridge separates the collision domain
Every 128 ip's
14 per network

2. EIGRP: What is the name of the algorithm used for EIGRP?
Segments
Query and other router responds with a REPLY packet.
IEEE 802.3z
DUAL: Difusing Update Algorithm

3. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Packets
R3(config)#router rip - R3(config-router)#network 192.168.1.2
/22
Shortest path first - (SPF)

4. RIP Timers: What is an Flush Timer?
255.255.255.252
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
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

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

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6. Subnetting: What is a /30 in Decimal
Query and other router responds with a REPLY packet.
255.255.255.252
255.255.255.224
Frames

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

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8. What gets the clock rate - DCE or DTE?
Hop Count
DCE
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
180 seconds

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

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10. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Every 32 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

11. OSPF: how do you change the cost of an interface for OSPF?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
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)#

12. IEEE Standards: Fast Ethernet
/24
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
1 - everything hooked to the hub is in the same collision domain

13. What is the Network PDU called?
Switch forwards the frame as soon as it can
/22
100
Packets

14. What is the layer 3 PDU called?
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Packets
Bellman-Ford

15. Subnetting: What is a /16 in Decimal
255.255.0.0
Show ip eigrp topology
255.255.255.252
110

16. EIGRP: What is the range of Autonomous System numbers?
Physical
Shortest path first - (SPF)
1-65535
Switch forwards the frame as soon as it can

17. RIP Timers: What is an Holddown Timer?
255.255.255.252
180
60
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

18. Subnetting: What is a 255.255.255.0 in prefix notation
60
/24
120
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

19. What is the metric for RIP
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
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)#

20. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Switch forwards frame once it completely receives it
2 - the bridge separates the collision domain
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
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)#

21. Using the magic number how to you figure the network?
D
Bandwidth - Delay - reliability and Load
Closest multiple of the magic number that is not over the interesting octets number.
30 per network

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

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23. What is the layer 4 PDU called?
Segments
Router(config)#ip route {exit-interface}
2 - each port is it's own collision domain
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

24. Rip: What does v2 have that v1 does not?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 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
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

25. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
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
Show ip eigrp topology

26. Subnetting: What is a /27 in Decimal
Segments
Every 4 ip's
Segments
255.255.255.224

27. What Layer does CDP operate at?
Layer 2
1 - everything hooked to the hub is in the same collision domain
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
DUAL: Difusing Update Algorithm

28. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
Every 8 ip's
110
2 hosts
Every 128 ip's

29. What is Layer 3 in the OSI Model?
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
Closest multiple of the magic number that is not over the interesting octets number.
Network
IEEE 802.3u

30. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
2 - each port is it's own collision domain
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

31. Name the OSI Layers
Physical
Every 4 ip's
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

32. Rip: Command to prevent rip updates on an interface
Network
DCE
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
IEEE 802.3

33. EIGRP: What is the hello packet used for?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Bandwidth - Delay - reliability and Load
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

34. What are the commands to setup SSH?
IEEE 802.3z
Every 64 ip's
255.255.255.224
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)#

35. What are the comands to set the clock rate in a serial connection?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
R1(config)#router rip - R1(config-router)#version 2
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Closest multiple of the magic number that is not over the interesting octets number.

36. Subnetting: What is a 255.128.0.0 in prefix notation
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
/9
D

37. What is Layer 6 in the OSI Model?
DCE
Every 32 ip's
Presentation
60

38. Subnetting: What is a 255.255.255.240 in prefix notation
/9
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
Every 8 ip's
/28

39. Symbol for Rip on a Show ip route
60
R
Every 64 ip's
IEEE 802.3z

40. OSPF: What does OSPF use for its metric?
255.255.255.128
Data-Link
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

41. Rip: how do hold down timers work?
R
Query and other router responds with a REPLY 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
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

42. Switching Methods: What is Cut-through?
Network
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Switch forwards the frame as soon as it can
IEEE 802.3z

43. Using the magic number how to you figure the broadcast?
Every 16 ip's
Pins 1+2 swap places with pins 3+6
Add the magic number to the network minus 1
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

44. What is the boot sequence for Cisco Routers?
120
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.
Switch forwards frame once it completely receives it

45. What is the metric for EIGRP
255.255.0.0
Router(config)#ip route {network address} {subnet-mask}
Bandwidth - Delay - reliability and Load
Add the magic number to the network minus 1

46. What is Layer 4 in the OSI Model?
Transport
Session
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
60

47. IEEE Standards: Gibabit Ethernet (Fibre)
Show ip eigrp topology
IEEE 802.3z
DUAL: Difusing Update Algorithm
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

48. Command for a static route with exit interface
Router(config)#ip route {exit-interface}
2 - the bridge separates the collision domain
255.255.255.224
Closest multiple of the magic number that is not over the interesting octets number.

49. Subnetting: What is a /25 in Decimal
255.255.255.128
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.
/22
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.

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

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