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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 /28
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2. Subnetting: What is a /30 in Decimal
110
255.255.255.252
2 - each port is it's own collision domain
180 seconds
3. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
IEEE 802.3ab
Segments
126 per network
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)#
4. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
100
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
5. Name the OSI Layers
Closest multiple of the magic number that is not over the interesting octets number.
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Every 128 ip's
6. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
1 - everything hooked to the hub is in the same collision domain
60
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
7. Subnetting: What is a 255.255.252.0 in prefix notation
Layer 2
/22
Periodic Updates of their routing table
14 per network
8. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
2 hosts
DCE
/28
Every 128 ip's
9. OSPF: What does OSPF use for its metric?
30 per network
Session
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
R1(config)#router rip - R1(config-router)#version 2
10. EIGRP: What is the name of the algorithm used for EIGRP?
Frames
Show ip eigrp topology
DUAL: Difusing Update Algorithm
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
11. What gets the clock rate - DCE or DTE?
Router(config)#ip route {network address} {subnet-mask}
120
DCE
D
12. EIGRP: What packet is used to search for networks?
Query and other router responds with a REPLY packet.
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
30 per network
Switch forwards frame once it completely receives it
13. Subnetting: What is a 255.255.255.240 in prefix notation
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Router(config)#ip route {network address} {subnet-mask}
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
/28
14. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
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
1-65535
Layer 2
15. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Every 32 ip's
2 - the bridge separates the collision domain
IEEE 802.3z
Packets
16. OSPF: how do you change the cost of an interface for OSPF?
Every 128 ip's
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Segments
Shortest path first - (SPF)
17. Subnetting: where do the networks break with a /26
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18. Rip Timers: How long is the default for Flush timer.
D
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
DUAL: Difusing Update Algorithm
60
19. What is the Data-Link PDU called?
Router(config)#ip route {exit-interface}
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Frames
Packets
20. EIGRP: What packet is used to propagate routing information?
60
/9
Every 128 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
21. Subnetting: What is a 255.128.0.0 in prefix notation
Switch forwards the frame as soon as it can
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
/9
22. What is the boot sequence for Cisco Routers?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
255.255.255.224
Every 128 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
23. EIGRP: What is the range of Autonomous System numbers?
Add the magic number to the network minus 1
255.255.255.224
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
1-65535
24. Subnetting: where do the networks break with a /30
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25. Using the magic number how to you figure the broadcast?
255.255.0.0
Switch forwards frame once it completely receives it
Transport
Add the magic number to the network minus 1
26. What is the layer 4 PDU called?
Segments
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Frames
27. IEEE Standards: Gibabit Ethernet (Copper)
Session
DCE
IEEE 802.3ab
IEEE 802.3z
28. Subnetting: What is a 255.255.255.0 in prefix notation
180 seconds
2 - the bridge separates the collision domain
Bandwidth - Delay - reliability and Load
/24
29. RIP: What Algorithm is used in RIP>
Shortest path first - (SPF)
Bellman-Ford
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
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. Switching Methods: What is Store and Forward?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Switch forwards frame once it completely receives it
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.
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
31. RIP Timers: What is an Holddown Timer?
Every 64 ip's
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
Bandwidth - Delay - reliability and Load
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
32. Subnetting: where do the networks break with a /29
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33. RIP Timers: What is an Flush Timer?
Bandwidth - Delay - reliability and Load
180 seconds
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
34. Subnetting: What is a /16 in Decimal
255.255.0.0
Every 4 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
35. Rip: What does v2 have that v1 does not?
255.255.255.252
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
120
36. How do you find the magic number for subnetting?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
IEEE 802.3u
255.255.255.252
Frames
37. Subnetting: where do the networks break with a /27
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38. OSPF: What is the process used by OSPF to build a routing table (step by step)
110
Transport
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
2 - the bridge separates the collision domain
39. Switching Methods: What is Cut-through?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
2 hosts
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Switch forwards the frame as soon as it can
40. Subnetting: What is a /25 in Decimal
255.255.255.128
Router(config)#ip route {exit-interface}
Pins 1+2 swap places with pins 3+6
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
41. How many Collision domains are there on a with 1 switch 2 computers?
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42. Command for a static route with exit interface
Transport
Router(config)#ip route {exit-interface}
Network
Every 32 ip's
43. What is the metric for RIP
Hop Count
Segments
Every 64 ip's
Shortest path first - (SPF)
44. What are the comands to set the clock rate in a serial connection?
Session
110
Periodic Updates of their routing table
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
45. What is the layer 2 PDU called?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Frames
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
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
46. Rip: What is the command to enable Ripv2?
120
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
R1(config)#router rip - R1(config-router)#version 2
47. Rip: how do hold down timers work?
30 per network
Frames
60
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
48. IEEE Standards: Gibabit Ethernet (Fibre)
255.255.255.224
Data-Link
/24
IEEE 802.3z
49. How many Collision domains are there on a with 1 hub and 2 computers?
255.255.192.0
R1(config)#router rip - R1(config-router)#version 2
1 - everything hooked to the hub is in the same collision domain
180 seconds
50. Subnetting: where do the networks break with a /25
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