Ccna Study Guide For Navy Ana Class

Front 1

What layer do routers work at?

Back 1

Layer 3
Network Layer

Front 2

How many layers are there in the OSI?

Back 2

7

Front 3

What are possible causes of LAN traffic congestion?

Back 3

- Too many hosts in a Broadcast domain
- broadcast storms
-multicasting
-low bandwidth
-hubs
-large # of ARP and IPX traffic

Front 4

What are two advantages of using routers on your network?`

Back 4

1. They don't forward broadcasts by default
2. They filter the network based on layer 3 (Network Layer) information (i.e. IP addresses)

Front 5

by default, what do switches break up

Back 5

Collision Domains

Front 6

what do routers break up

Back 6

Boradcast domains

Front 7

What are some advantages of using the OSI layer?

Back 7

- allows various types of network hardware and software to communicate.
- industry standardization
- aids in component development

Front 8

Which layer chooses and determines the availabilty of communicatiing partners, along with the resources necessary to make the connection; cordinates partnering applications and forms a consensus on procedures for controlling data integrity and error recovery?

Back 8

Application Layer (layer 7)

Front 9

Which layer is responsible for converting Data packets from the Data link Layer into electrical signals?

Back 9

Physical Layer (layer 1)

Front 10

At what layer is routing implemented, enabling connections and path selections between two end systems?

Back 10

Network Layer (layer 3)

Front 11

Which layer defines how data is formatted, presented, encoded, and converted for use on the network?

Back 11

Presentation Layer (layer 6)

Front 12

Which layer is responsible for creating, managing, and terminating sessions between applications?

Back 12

Session Layer (layer 5)

Front 13

Which layer ensures the trustworthy transmission of data across a physical link and is primarily concerned with physical addressing, line discipline, network topology, error notification, orderes delivery of frames, and flow control?

Back 13

Data Link Layer (layer 2)

Front 14

What layer is used for reliable communications between end nodes over the netowrk and provides mechanisms for establishing, maintaining, and terminating virtuial circuits, transport-fault detection and recovery and acontrolling the flow of information?

Back 14

Transport Layer (layer 4)

Front 15

What layer is represented by frames?

Back 15

Data Link (layer 2)

Front 16

What layer is represented by segments?

Back 16

Transport Layer (layer 4)

Front 17

What layer is represented by packets?

Back 17

Network Layer (layer 3)

Front 18

What layer is represented by bits?

Back 18

Physical Layer (layer 1)

Front 19

What layer segments and reassembles data into a data stream?

Back 19

Transport Layer (layer 4)

Front 20

Which layer provides the physical transmission of the data and handles error notification, network topology and flow control?

Back 20

Data Link (layer 2)

Front 21

What layer manages device addressing, tracks the location of devices on the network and determines the best way to move data?

Back 21

Network Layer (layer 3)

Front 22

What is the length and expression from a MAC address?

Back 22

Hexadecimal and 48 bits (6 bytes)

Front 23

What layer will you find Media Access Control (MAC) and Logical Link Control (LLC)?

Back 23

Data Link (layer 2)

Front 24

What is crosstalk?

Back 24

Crosstalk is the unwanted signal interference from adjacent pairs in the cable.

Front 25

10Base2 has what speed and what length can it be?

Back 25

10Mbps, up to 185 meters in length

Front 26

10Base5 has what speed and what length can it be?

Back 26

10 Mbps, up to 500 meters in length

Front 27

What type of devices can you use Straight-Through Cables for?

Back 27

UN-Alike
Host to switch or hub
router to switch or hub

Front 28

What type of devices can you use Crossover Cables?

Back 28

Alike
switch to switch
hub to hub
host to host
hub to switch
router direct to host

Front 29

What type of devices can you use Rolled Cables?

Back 29

a host to a router console serial communication (com) port.

Front 30

What are the 4 different Protocol Data Units (PDU's) and what layer do you find them at?

Back 30

Segment = Transport Layer
Packet = Network Layer
Frame = Data link Layer
Bits = Physical Layer

Front 31

How many layers are there in the DoD version of the OSI Model?

Back 31

4

Front 32

What are the layers of the DoD version of the OSI Model?

Back 32

- Process/Application Layer
- Host to Host Layer
- Internet Layer
- Network Access Layer

Front 33

The Process/Application Layer consists of what layers of the OSI Model?

Back 33

Application Layer (layer 7)
Presentaion Layer (layer 6)
Session Layer (layer 5)

Front 34

The Host to Host Layer consists of what layers of the OSI Model?

Back 34

Transport Layer (layer 4)

Front 35

The Internet Layer consists of what layers of the OSI Model?

Back 35

Network Layer (layer 3)

Front 36

The Network access Layer consists of what layers of the OSI Model?

Back 36

Data Link Layer (layer 2)
Physical Layer (layer 1)

Front 37

What does ARP do?

Back 37

resolves ip to MAC address

Front 38

What does RARP do?

Back 38

Resolves Mac Address to IP

Front 39

What is the range for a Class A IP address?

Back 39

00000000 - 01111111
0 - 127

Front 40

What is the range for a Class B IP address?

Back 40

10000000 - 10111111
128 - 191

Front 41

What is the range for a Class C IP address?

Back 41

11000000 - 11011111
192 - 223

Front 42

What IP would you use to send a test packet to itself witout generating network traffic?

Back 42

127.0.0.1

Front 43

What are the reserved IP address spaces?

Back 43

A-10.0.0.0 -10.255.255.255
B-172.16.0.0 -172.31.255.255
C-192.168.0.0 -192.168.255.255

Front 44

Where does CISCO load its IOS from?

Back 44

Flash

Front 45

What is the first thing that the router does when you turn it on?

Back 45

Power-on self test (POST)

Front 46

Where is the startup-configuration located?

Back 46

NVRAM

Front 47

What do you type to abort the setup of the router?

Back 47

Ctrl C

Front 48

If you need help what character do you use?

Back 48

?

Front 49

How can you tell if something is a default setting?

Back 49

It will be in square brackets []

Front 50

What command will provide you with the basic configuration for the system hardware as well as the software version, the names and sources of configuration files, and the boot images?

Back 50

sh version (sh ver)

Front 51

What is the most common banner that you can place on your router and what is the command to set it?

Back 51

The Message of the Day Banner (motd)
banner motd #message#

Front 52

How many password are there to secure your Cisco Router?

Back 52

5

Front 53

Whate are the different passwords that you can set on your Cisco Router?

Back 53

1. Console
2. Auxiliary
3. Telnet (vty)
4. Enable Password (en)
5. Enable Secret Password

Front 54

What command would you use to find out if your Router is the DCE?

Back 54

sh controllers (interface - i.e s0/0)

Front 55

What command would you use to set the clock rate?

Back 55

clock rate (#) ie 64000

Front 56

What command would you use to show layer 3 interface info?

Back 56

sh ip interface

Front 57

What command provides a quick overview of the routers interfaces including the logical address and status?

Back 57

sh ip int brief

Front 58

What protocols are assigned to an interface and determine the method of packet delivery using IP and IPX?

Back 58

Routed Protocols

Front 59

What protocols are used for taking a packet from one device and sending it through the network to another device on a different network?

Back 59

Routing Protocol

Front 60

What are the three different types of routing?

Back 60

- Static
- Default
- Dynamic

Front 61

What is a command that you can use to see static routes?

Back 61

sh ip route

Front 62

What is Administrative Distance used for?

Back 62

It is used to rate the trustworthiness of routing information recieved on a router from a neighbor router.

Front 63

What is the Administrative Distance for EIGRP?

Back 63

90

Front 64

What is the Administrative Distance for IGRP?

Back 64

100

Front 65

What is the Administrative Distance for OSPF?

Back 65

110

Front 66

What is the Administrative Distance for RIP?

Back 66

120

Front 67

What is the Administrative Distance for a connected interface?

Back 67

0

Front 68

What is the Administrative Distance for a Static route?

Back 68

1

Front 69

What is the Administrative Distance for External EIGRP?

Back 69

170

Front 70

True/False - You must use a classful network number when configuring IGRP?

Back 70

True

Front 71

What is the enhanced distance-vector protocol that gives us a real edge over other Cisco proprietary protocol IGRP?

Back 71

Enhanced IGRP (EIGRP)

Front 72

What protocol uses wild card masks?

Back 72

OSPF

Front 73

What OSI Modle Layer do Switches work at?

Back 73

Layer 2 - Data Link Layer

Front 74

What are the different Spanning tree port states?

Back 74

Blocking
Listening
Learning
Forwarding
Disabled

Front 75

What are the 3 different LAN Switch types?

Back 75

- Cut-through (fastforward)

- Fragment Free (modified cut-through)

- Store and forward

Front 76

What are some different connection types a WAN can use?

Back 76

- Dedicated
- Circuit-Switched
- Packet-Switched

Front 77

What layer does PPP work at?

Back 77

Layer 2
Data Link Layer

Front 78

What are the two methods of authentication that can be used with PPP?

Back 78

- PAP
- CHAP

Front 79

What one is more secure PAP or CHAP?

Back 79

CHAP

Front 80

How many types of Frame Relay encapsulations are there?

Back 80

2
Cisco and ietf

Front 81

What kind of Circuts does Frame Relay use?

Back 81

Virtual circuts, as opposed to real circuts that leased lines use.

Front 82

What are the 3 Frame Relay Congestion Bits called?

Back 82

- Discard Eligibility (DE)
- Forward Explicit congestion Notification (FECN)
-Backward Explicit congestion Notification (BECN)

Front 83

What is our ISDN Reference Point?

Back 83

"U"

Front 84

When is Dial on Demand Routing (DDR) used?

Back 84

Only used for low-volume, periodic network connection using a Plain Old Telephone Service (POTS) or IDSN connection.

Front 85

What is the command that you type to set a static route?

Back 85

ip route [destination_network] [mask] [next-hop_address or interface] [adminitrative_distance] [permanent]

Front 86

ip route 172.16.3.0 255.255.255.0 192.168.2.4
What can you tell me about this static route?

Back 86

-The ip route command tells us simply that it is a static route
-172.16.3.0 is the remote network we want to send packets to.
-255.255.255.0 is the mask of the remote network.
-192.168.2.4 is the next hop or router we will send packets to.

Front 87

What command do you use to set the Enable Secret Password to Cisco?

Back 87

en
config t
enable secret Cisco

Front 88

What is a network technology that is based on the transmission of data in packets that devides a continuous stream of data into small units-packets-enables data from multiple devices on a network to share the same communication channel simultaneously but also requires the use of precise routing information?

Back 88

Packet Switching

Front 89

Define what a CO is.

Back 89

Central Office: The local telephone company ofice where all loops in a certain area connect and where circuit switching of suscriber lines occurs.

Front 90

What command sets the type of ISDN switch that the router will communicate with; can be sat at interface level or global configuration mode?

Back 90

isdn switch-type

Front 91

What command will show if your SPID's are valid and if you are connected and communicating with the providers switch?

Back 91

sh isdn status

Front 92

What command will connect, view, and run programs on a remote device?

Back 92

Telnet

Front 93

What command sends console messages displaying information about RIP packets being sent and received on a router interface?

Back 93

debug ip rip

Front 94

What command shows message requests from neighbor routers asking for an update and the broadcasts sent from your router to that neighbor router?

Back 94

debug ip igrp transactions

Front 95

What command provides a summary of the IGRP routing information running on the network?

Back 95

debug ip igrp events

Front 96

What does the clock rate command do?

Back 96

It provides clocking on a serial DCE interface.

Front 97

What protocol does PPP use to identify the Network layer protocol?

Back 97

NCP - Network COntrol Protocol is used to help identify the network layer protocol used in the packet.

Front 98

How many root bridges can you have on a network?

Back 98

One

Front 99

What PPP protocol provides dynamic addressing, authentication, and Multilink?

Back 99

LCP - Link Control Protocol in the PPP stack provides dynamic addressing, authentication, and multilink.

Front 100

What 3 things are loaded when the router is initialized?

Back 100

1. Bootstrap 2. The Operating System 3. Configuration File

Front 101

What does a router do if it cannot find a configuration file?

Back 101

Enters setup mode

Front 102

Where is the bootstrap program loaded

Back 102

Rom

Front 103

Routers breakup ___________ Domains.

Back 103

Broadcast

Front 104

Switches breakup ___________ Domains

Back 104

Collision

Front 105

What is more efficient for relieving congestion on networks?

Switches or Hubs

Back 105

Switches

Front 106

What are some of the functions of the APPLICATION layer?

Back 106

File
Print
Message
Database
Application services

Front 107

What are some of the functions of the PRESENTATION layer?

Back 107

Data encryption

Compression

Translation services

Front 108

What is the function of the SESSION layer?

Back 108

Dialog control

Front 109

What is the function of the TRANSPORT layer?

Back 109

End-to-end connection

Front 110

What is the function of the NETWORK layer?

Back 110

Routing

Front 111

What is the function of the DATA LINK layer?

Back 111

Framing

Front 112

What is it call when you place a frame within a different type of frame?

Back 112

Tunneling

Front 113

What is the function of the PHYSICAL layer?

Back 113

Physical topology

Front 114

What is administrative distance (AD)?

Back 114

Rates the trustworthiness
(0-255) of the routing information received on a router from a neighbor router. The lower the better.

Front 115

What is the difference between routed and routing protocols?

Back 115

Routed protocols are used to transmit user data through an internetwork.

Routing protocols are used to update routing tables between routers.

Front 116

Default Administrative Distances?

Back 116

ROUTE SOURCE DEFAULT AD
Connected interface 0
Static route 1
EIGRP 90
IGRP 100
OSPF 110
RIP 120
External EIGRP 170
Unknown 255

Front 117

What is the command to setup a default route?

Back 117

ip route XXX.XXX.XXX.0{network ip} XXX.XXX.XXX.XXX{SNM} XXX.XXX.XXX.XXX{interface}

Front 118

What are routing loops and what can we do to stop them?

Back 118

Routing loops are caused by every router not being updated simultaneousely.

Some methods of stopping this are adding a Maximum Hop Count, Split Horizon, Route Poisoning, and Holddowns.

Front 119

How long it takes for a routing table entry to become invalid or questionable is called what?

Back 119

Maximum hop count

Front 120

"not allowing routing information to be sent back in the direction it was received" is called what?

Back 120

Split horizon

Front 121

Advertising a route as 16
(or infinite) if the route is inconsistently updating is called what?

Back 121

Route Poisoning

Front 122

Preventing regular update messages from reinstating a route that is going up and down (flapping) is called what?

Back 122

Hold downs

Front 123

What requires an autonomous system number?

Back 123

Eigrp

Front 124

What uses bandwidth and delay of the line by default as a metric for determining the best route to an internetwork

Back 124

IGRP

Front 125

Remember that all routers in your internetwork must use the same “what” number if you want them to share routing information?

Back 125

AS
Autonomous system

Front 126

Where do we get the Autonomous System (AS) Number?

Back 126

From IANA

Front 127

What protocol uses the Autonomous System (AS)?

Back 127

OSPF

Front 128

What command sends routing updates as they are sent and received on the router to the console session?

Back 128

debug ip rip

Front 129

What Protocol is a Cisco-proprietary distance-vector routing protocol?

Back 129

Interior Gateway Routing Protocol (IGRP)

Front 130

What is the classless, enhanced distance-vector protocol that gives us a real edge over another Cisco proprietary protocol, Interior Gateway Routing Protocol (IGRP)?

Back 130

Enhanced IGRP (EIGRP)

Front 131

Like IGRP, EIGRP uses the concept of an autonomous system to describe the set of contiguous routers that run the same routing protocol and share routing information. But unlike IGRP, EIGRP includes the
______ ________in its route updates.

Back 131

subnet mask

Front 132

What are three distinct functions of layer 2 switching?

Back 132

address learning
forward/filter decisions
loop avoidance

Front 133

Layer 2 switches and bridges remember the source hardware address of each frame received on an interface, and they enter this information into a MAC database called a forward/filter table.

Back 133

Address learning

Front 134

What are the three switching modes?

Back 134

Cut-through (FastForward)
FragmentFree (modified cut-through)
Store-and-forward

Front 135

PDUs at the Network layer of the OSI are called what?

Back 135

Packets

Front 136

When data is encapsulated, which is the correct order?

Back 136

Data, segment, packet, frame, bit

Front 137

What are two purposes for segmentation with a bridge?

Back 137

-Create more collision
domains.

-Add more bandwidth for users.

Front 138

You try to telnet into SFRouter from router Corp and receive this message:
Corp#telnet SFRouter
Trying SFRouter (10.0.0.1)...Open
Password required, but none set
[Connection to SFRouter closed by foreign host]
Corp#
What is the sequences that will address this problem correctly?

Back 138

D. SFRouter(config)#line vty 0 4
SFRouter(config-line)#login
SFRouter(config-line)#password cisco