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Test your basic knowledge |
CCENT
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
ccent
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
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: where do the networks break with a /27
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2. Command for a static route with 'Next Hop' Address
Every 32 ip's
Router(config)#ip route {network address} {subnet-mask}
126 per network
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
3. Rip: What does v2 have that v1 does not?
60
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Presentation
126 per network
4. Using the magic number how to you figure the broadcast?
Presentation
Add the magic number to the network minus 1
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
5. Subnetting: where do the networks break with a /30
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6. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
D
30 per network
IEEE 802.3u
7. Subnetting: where do the networks break with a /26
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8. What is the Data-Link PDU called?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Segments
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Frames
9. What is the boot sequence for Cisco Routers?
Every 4 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Periodic Updates of their routing table
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
10. CABLES: What is the T568B Pinout Standard?
R
2 - the bridge separates the collision domain
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)
11. Subnetting: where do the networks break with a /25
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12. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
14 per network
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Network
13. OSPF: What is the process used by OSPF to build a routing table (step by step)
30 per network
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Hop Count
Every 8 ip's
14. RIP Timers: What is an Holddown Timer?
Bandwidth - Delay - reliability and Load
Every 4 ip's
180 seconds
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
15. What is the metric for RIP
Hop Count
110
Segments
Every 128 ip's
16. OSPF: how do you change the cost of an interface for OSPF?
110
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Every 16 ip's
17. What is Layer 1 in the OSI Model?
Physical
110
1-65535
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
18. IEEE Standards: Gibabit Ethernet (Fibre)
/9
IEEE 802.3z
Application
Physical
19. RIP: What is the default Administrative Distance?
Switch forwards the frame as soon as it can
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
20. RIP Timers: What is an Flush Timer?
Layer 2
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
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.
Hop Count
21. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
60
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
/28
2 - the bridge separates the collision domain
22. What is Layer 2 in the OSI Model?
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
DUAL: Difusing Update Algorithm
100
Data-Link
23. How do you find the magic number for subnetting?
Switch forwards frame once it completely receives it
62 per network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
24. What is the layer 3 PDU called?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Session
/24
Packets
25. What Layer does CDP operate at?
R1(config)#router rip - R1(config-router)#version 2
/24
Layer 2
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
26. Subnetting: What is a 255.255.255.240 in prefix notation
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.
/28
2 - the bridge separates the collision domain
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
27. Subnetting: where do the networks break with a /29
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28. What gets the clock rate - DCE or DTE?
2 hosts
DCE
Switch forwards frame once it completely receives it
180
29. What is the layer 4 PDU called?
Segments
Every 4 ip's
Physical
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
30. Symbol for Rip on a Show ip route
R
255.255.255.224
30 per network
180
31. 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
14 per network
IEEE 802.3u
126 per network
32. What is the Transport PDU called?
Bellman-Ford
IEEE 802.3z
Segments
Packets
33. What is Layer 5 in the OSI Model?
Bellman-Ford
1-65535
Session
120
34. RIP Timers: What is an invalid Timer?
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.
Data-Link
Frames
D
35. Using the magic number how to you figure the network?
Packets
Closest multiple of the magic number that is not over the interesting octets number.
Packets
255.255.0.0
36. Subnetting: What is a /18 in Decimal
255.255.192.0
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
255.255.255.128
Add the magic number to the network minus 1
37. What is Layer 4 in the OSI Model?
100
1 - everything hooked to the hub is in the same collision domain
Transport
30 per network
38. Subnetting: What is a /27 in Decimal
255.255.255.224
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
IEEE 802.3
Every 32 ip's
39. Rip: how do hold down timers work?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Frames
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
40. RIP: What Algorithm is used in RIP>
Bellman-Ford
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
180
Frames
41. Name the TCP/IP Layers
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
255.255.255.128
Segments
D
42. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
/24
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
/9
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
43. EIGRP: What is the range of Autonomous System numbers?
Presentation
Session
180 seconds
1-65535
44. What are the comands to set the clock rate in a serial connection?
Bandwidth - Delay - reliability and Load
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Router(config)#ip route {exit-interface}
45. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
/24
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
IEEE 802.3
46. OSPF: What Algorithm is used?
Shortest path first - (SPF)
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Segments
Every 8 ip's
47. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
D
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 hosts
Packets
48. Rip Timers: How long is the default for Holddown timer.
Pins 1+2 swap places with pins 3+6
62 per network
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
180
49. What is the metric for EIGRP
Presentation
Bandwidth - Delay - reliability and Load
/22
Show ip eigrp topology
50. Subnetting: What is a /30 in Decimal
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
255.255.255.252
Every 64 ip's
180 seconds