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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: What does v2 have that v1 does not?
Query and other router responds with a REPLY packet.
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
Shortest path first - (SPF)

2. What is Layer 4 in the OSI Model?
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.
Bandwidth - Delay - reliability and Load
Transport

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

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4. What is Layer 3 in the OSI Model?
Physical
Network
120
Query and other router responds with a REPLY packet.

5. What gets the clock rate - DCE or DTE?
/9
Closest multiple of the magic number that is not over the interesting octets number.
DCE
Segments

6. Subnetting: What is a 255.255.255.0 in prefix notation
Data-Link
/24
Presentation
IEEE 802.3ab

7. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
2 hosts
IEEE 802.3ab
Closest multiple of the magic number that is not over the interesting octets number.
/28

8. EIGRP: What is the name of the algorithm used for EIGRP?
Hop Count
2 - the bridge separates the collision domain
DUAL: Difusing Update Algorithm
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

9. EIGRP: What is the hello packet used for?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
62 per network
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

10. What is Layer 5 in the OSI Model?
IEEE 802.3u
R1(config)#router rip - R1(config-router)#version 2
Session
IEEE 802.3ab

11. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
14 per network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
60
/24

12. Switching Methods: What is Cut-through?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Layer 2
255.255.255.252
Switch forwards the frame as soon as it can

13. What is the metric for RIP
255.255.255.128
D
255.255.0.0
Hop Count

14. What is the layer 4 PDU called?
Segments
Frames
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
/24

15. How many Collision domains are there on a with 1 hub and 2 computers?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
1 - everything hooked to the hub is in the same collision domain
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
2 - each port is it's own collision domain

16. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
R
R3(config)#router rip - R3(config-router)#network 192.168.1.2
R1(config)#router rip - R1(config-router)#version 2
Every 64 ip's

17. CABLES: What is the T568A Pinout Standard?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
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
/24

18. Symbol for EIGRP on a Show ip route
Packets
D
Transport
1 - everything hooked to the hub is in the same collision domain

19. What is the Transport PDU called?
Segments
/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
126 per network

20. How do you find the magic number for subnetting?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
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.
2 - each port is it's own collision domain

21. What is the boot sequence for Cisco Routers?
D
Segments
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)

22. EIGRP: What packet is used to search for networks?
100
Query and other router responds with a REPLY packet.
110
Pins 1+2 swap places with pins 3+6

23. Subnetting: What is a /18 in Decimal
R3(config)#router rip - R3(config-router)#network 192.168.1.2
255.255.192.0
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
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

24. Subnetting: What is a /25 in Decimal
Physical
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
120
255.255.255.128

25. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
2 - each port is it's own collision domain
180 seconds
Transport

26. What is Layer 7 in the OSI Model?
Application
Packets
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)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

27. 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.
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

28. OSPF: What is the process used by OSPF to build a routing table (step by step)
180
Session
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

29. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
Switch forwards frame once it completely receives it
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.
Every 16 ip's

30. What are the commands to setup SSH?
/24
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)#
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Every 8 ip's

31. IEEE Standards: Fast Ethernet
Hop Count
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
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

32. Subnetting: What is a /16 in Decimal
DUAL: Difusing Update Algorithm
255.255.0.0
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
/24

33. What is the metric for EIGRP
255.255.192.0
D
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Bandwidth - Delay - reliability and Load

34. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
IEEE 802.3ab
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
30 per network

35. Switching Methods: What is Fragment-free?
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.
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
255.255.255.224

36. What is Layer 1 in the OSI Model?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Closest multiple of the magic number that is not over the interesting octets number.
/9
Physical

37. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
IEEE 802.3ab
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
2 hosts
255.255.255.252

38. EIGRP: How do you view if there are any successor routes?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
14 per network
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
Show ip eigrp topology

39. Subnetting: What is a /27 in Decimal
255.255.255.224
DCE
/22
/24

40. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
2 hosts
Packets
2 - the bridge separates the collision domain

41. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
180 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

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

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43. Subnetting: What is a /30 in Decimal
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
255.255.255.252
Application
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

44. What Layer does CDP operate at?
1 - everything hooked to the hub is in the same collision domain
DCE
Layer 2
Show ip eigrp topology

45. Subnetting: What is a 255.255.252.0 in prefix notation
/22
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

46. Name the TCP/IP Layers
255.255.0.0
Switch forwards the frame as soon as it can
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

47. What are the comands to set the clock rate in a serial connection?
1 - everything hooked to the hub is in the same collision domain
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
14 per network
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

48. OSPF: What Algorithm is used?
Segments
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
R
Shortest path first - (SPF)

49. OSPF: What is the default administrative distance?
1-65535
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
110
120

50. What is Layer 6 in the OSI Model?
Presentation
Packets
Add the magic number to the network minus 1
100

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