Ccna 1121 Final Exam

Front 1

Router and switch IOS is stored where?

Back 1

In non-volatile flash memory (NVRAM) on the router.

Front 2

Router and switch startup-config is stored where?

Back 2

NVRAM

Front 3

The IOS file is expanded into where at boot up?

Back 3

RAM

Front 4

What is the difference between ssh and telnet?

Back 4

SSH is newer and has stronger encryption and password authentication.

Front 5

Why are we putting phone and video and data all together in an IP network? aka, what is the point of convergence?

Back 5

Simplifying hardware and putting everything on one device. Long-distance calls are free over the internet.

Front 6

What is an extranet?

Back 6

A part of an intranet which is extended to users outside the company, such as business partners

Front 7

What do the keyboard commands (control shift 6) and (control c) do?

Back 7

[Control + Shift + 6] = Interrupt a running IOS process such as Ping or Traceroute. [Control + C] = Abort current command or exit config mode.

Front 8

What does pressing the Tab key do when entering a command in the IOS?

Back 8

Command line completion. Type ‘sh tab’ will turn into ‘show’ and so on.

Front 9

Can hostnames have spaces in them?

Back 9

No.

Front 10

Know the names of the modes, like user exec and priv

Back 10

User Exec - “View Only”, no ability to change the system.

Privileged Exec - Admin layer, applies changes that affect the whole device.

Global Config - Primary config mode for whole-device changes.

Specific configuration modes - Sub-config modes that affect specific parts of the device, such as ports.

Front 11

Know what passwords protect what modes: enable, console, telnet

Back 11

Enable - Limits access to Privileged Exec mode.

Console - Limits device access using the console connection.

Telnet - Limits device access over Telnet.

Front 12

What does “copy run start” do?

Back 12

Set your current configuration to be the startup config.

Front 13

What interface do you put the ip address on a switch?

Back 13

Switch Virtual Interface

Front 14

What does the loopback address do? is this only for cisco devices?

Back 14

Network software and utilities send signals to this address when they want to query the computer’s own connection stats. No.

Front 15

What does ARP do?

Back 15

Finds out the IP address of a MAC address

Front 16

What acronym is commonly used when referring to organizing data by priority?

Back 16

QoS - Quality of Service

Front 17

What is DSL?

Back 17

High-speed internet connection that uses phone lines.

Front 18

What happens at the Transport, Network, Data Link, and Physical layers of the OSI model?

Back 18

Transport - Ensures complete data transfer between hosts.

Network - Creates paths between nodes to transmit data along.

Data Link - Encodes and decodes data into bits.

Physical - Conveyance of the bit stream via electrical impulse, light, radio, etc.

Front 19

The Internet layer of the TCP/IP Model is the same as which layer of the OSI Model?

Back 19

Network Layer

Front 20

What procedure reduces cross talk within a data cable?

Back 20

Twisting the cable.

Front 21

Ethernet is CSMA /CA or CD?

Back 21

Collision Detection

Front 22

What header uses sequence and acknowledgement numbers?

Back 22

TCP

Front 23

What do the sequence and acknowledgement numbers do?

Back 23

Sequence numbers allow a TCP session to keep track of how much data it has sent. Acknowledgement numbers are sent by a receiving host to confirm that data was received accurately.

Front 24

If a switch receives a frame header with a MAC address that does not appear in the CAM table, how does the switch forward the frame?

Back 24

It will flood the frame and broadcast to every computer on the network to try to find the unknown MAC address.

Front 25

Auto mdix what is it?

Back 25

Ports on a switch will automatically detect what sort of cable is plugged into them and will make internal adjustments to themselves accordingly.

Front 26

Define routing?

Back 26

The process of moving a packet of data from one device to another.

Front 27

What does tcp do that udp does not do?

Back 27

It checks to ensure the packets have been received by the destination address.

Front 28

How are private IP addresses able to communicate on the Internet?

Back 28

The router with its public IP address acts as a middleman, delivering data to addresses on its network and rejecting anything else.

Front 29

Where does a router look for the startup config? 3 locations, in order

Back 29

Flash memory, TFTP server, ROM.

Front 30

What happens when udp traffic doesn't arrive at the destination device?

Back 30

The source continues broadcasting.

Front 31

List all private ip address ranges?

Back 31

10.0.0.0 - 10.255.255.255

172.16.0.0 - 172.31.255.255

192.108.0.0 - 192.168.255.255

Front 32

What default settings on a wireless router could affect security?

Back 32

Change default name, turn off broadcasting, use WPA encryption, turn on the firewall, set a password.

Front 33

Which wireless security protocol is stronger? WEP or WPA

Back 33

WPA

Front 34

Are there more public IP addresses or private IP addresses?

Back 34

Public

Front 35

What does the command “ipv6 unicast -routing” do?

Back 35

It globally enables IPV6 on your router. It must be used first for IPV6 to be used.

Front 36

What prefix do all IPv6 multicast IP addresses use?

Back 36

ff00::/8

Front 37

Can you calculate TTL with hop count?

Back 37

Yes

Front 38

FCS what is it, what does it do?

Back 38

Frame Check Sequence, a bit of error-checking code.

Front 39

Bytes vs nibbles?

Back 39

Byte = 8 bits, nibbles = 4 bits.

Front 40

What is the difference between a layer 2 and layer 3 switch?

Back 40

Layer 2 uses MAC addresses. Layer 3 uses IP addresses.

Front 41

DHCP what are the 4 packet names, does the process start at source or destination, what order are the packets delivered?

Back 41

DHCPDISCOVER, DHCPOFFER, DHCPREQUEST, DHCPACK

Front 42

AAA what does it stand for, what is the major function for each of the A's

Back 42

Authentication - Identify users by name and password.

Authorization - Limit access to users based on name and clearance levels.

Accounting - Record what users do while logged in.

Front 43

Ipconfig /displaydns shows what on a pc?

Back 43

The contents of the DNS cache.

Front 44

What is the purpose of the “show file systems” command?

Back 44

To list available file systems.

Front 45

Describe the tftp process

Back 45

Client asks for data. Server sends data in 512-byte packets. Client sends back acknowledgement signal between packets. Transmission ends when a packet less than 512 bytes is sent. Lost packets will be re-transmitted.

Front 46

Define a broadcast message

Back 46

A signal that gets sent to all available addresses.

Front 47

What is the purpose of ICMP messages?

Back 47

To provide feedback of IP packet transmissions.