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CCENT

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. Rip: how do hold down timers work?
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}
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

2. What is Layer 7 in the OSI Model?
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.
Application
255.255.192.0
255.255.255.252

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

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4. How many Collision domains are there on a with 1 hub and 2 computers?
Segments
1 - everything hooked to the hub is in the same collision domain
100
14 per network

5. CABLES: What is the T568A Pinout Standard?
Packets
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Switch forwards the frame as soon as it can
Segments

6. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
180 seconds
100
Every 32 ip's
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

7. OSPF: What is the default administrative distance?
Every 128 ip's
180 seconds
110
IEEE 802.3ab

8. RIP Timers: What is an invalid Timer?
Physical
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.
D
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

9. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
255.255.255.252
/24
Show ip eigrp topology
126 per network

10. Rip: What does v2 have that v1 does not?
D
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

11. What Layer does CDP operate at?
60
/9
126 per network
Layer 2

12. OSPF: What Algorithm is used?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
/24
Every 64 ip's
Shortest path first - (SPF)

13. Rip Timers: How long is the default for Flush timer.
Every 128 ip's
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
60
Router(config)#ip route {network address} {subnet-mask}

14. CABLES: What is the T568B Pinout Standard?
Switch forwards the frame as soon as it can
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
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
Segments

15. What gets the clock rate - DCE or DTE?
Transport
Show ip eigrp topology
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
DCE

16. EIGRP: What packet is used to propagate routing information?
R1(config)#router rip - R1(config-router)#version 2
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
120

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

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18. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Every 4 ip's
255.255.0.0
62 per network
Physical

19. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
IEEE 802.3ab
Bellman-Ford
1 - everything hooked to the hub is in the same collision domain

20. EIGRP: What is the default administrative distance?
DUAL: Difusing Update Algorithm
Frames
100
Pins 1+2 swap places with pins 3+6

21. IEEE Standards: Ethernet
180 seconds
IEEE 802.3
Closest multiple of the magic number that is not over the interesting octets number.
Every 16 ip's

22. Name the OSI Layers
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
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
Bellman-Ford

23. Subnetting: What is a 255.255.255.0 in prefix notation
/24
R1(config)#router rip - R1(config-router)#version 2
120
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. Subnetting: What is a /25 in Decimal
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
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
255.255.255.128

25. Command for a static route with 'Next Hop' Address
Closest multiple of the magic number that is not over the interesting octets number.
Show ip eigrp topology
Every 4 ip's
Router(config)#ip route {network address} {subnet-mask}

26. Subnetting: What is a /18 in Decimal
255.255.192.0
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Session
Switch forwards frame once it completely receives it

27. Rip Timers: How long is the default for Invalid timer.
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
/9
180 seconds
255.255.255.128

28. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
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
DUAL: Difusing Update Algorithm
/24
2 - each port is it's own collision domain

29. Subnetting: What is a /16 in Decimal
180
Router(config)#ip route {network address} {subnet-mask}
IEEE 802.3
255.255.0.0

30. What is the boot sequence for Cisco Routers?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Presentation

31. EIGRP: What is the hello packet used for?
Show ip eigrp topology
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Periodic Updates of their routing table
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

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

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33. RIP: What Algorithm is used in RIP>
Bellman-Ford
IEEE 802.3ab
Every 4 ip's
Frames

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

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35. RIP Timers: What is an Flush Timer?
1-65535
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.
255.255.255.224
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

36. What is the metric for RIP
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Hop Count
Bandwidth - Delay - reliability and Load
IEEE 802.3u

37. What are the commands to setup SSH?
Every 16 ip's
Switch forwards the frame as soon as it can
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)#
/22

38. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
Bandwidth - Delay - reliability and Load
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Data-Link

39. Using the magic number how to you figure the network?
Show ip eigrp topology
Closest multiple of the magic number that is not over the interesting octets number.
Packets
100

40. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
DUAL: Difusing Update Algorithm
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
30 per network

41. What is the Data-Link PDU called?
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
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
Frames
Layer 2

42. Subnetting: What is a /27 in Decimal
Presentation
DCE
255.255.255.224
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. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
R1(config)#router rip - R1(config-router)#version 2
2 hosts
IEEE 802.3ab
/22

44. Command for a static route with exit interface
255.255.255.224
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}
255.255.255.128

45. RIP: What is the default Administrative Distance?
180 seconds
120
R3(config)#router rip - R3(config-router)#network 192.168.1.2
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)#

46. What is the Transport PDU called?
Segments
IEEE 802.3z
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
2 - the bridge separates the collision domain

47. Subnetting: What is a /30 in Decimal
/22
Show ip eigrp topology
255.255.255.252
Physical

48. Subnetting: What is a 255.255.252.0 in prefix notation
Shortest path first - (SPF)
/22
255.255.255.252
Layer 2

49. Subnetting: What is a 255.128.0.0 in prefix notation
/9
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Switch forwards frame once it completely receives it

50. What is the metric for EIGRP
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.
R1(config)#router rip - R1(config-router)#version 2
Bandwidth - Delay - reliability and Load
Closest multiple of the magic number that is not over the interesting octets number.

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