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Cisco CCNA 200-125 > Network Fundamentals > Flashcards

Flashcards in Network Fundamentals Deck (147)
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1

Tell me about global unicast

usually /3 3 bits beginning 45 bits global routing prefix 16 bits subnet id 64 bits interface id

2

Tell me about ipv6 multicast

FF as first two hexadecimal digits
FF02:1 all nodes in local scope
FF02:2 all routers in scope
8 bits of 1, Flags for 4 bits, Scope for 4 bits, Group ID for 112 bits
ORPT for flags, if R is set to 1 P and T set to 1 (rendezvous point)

3

Tell me about link local address

FE80::interface ID
10 Bits Mask + 54 bits 0's + Interface ID
Can only communicate on network segment

4

Unique Local Address

FC00::/7 cannot be routed over public internet (think of it as a private address) eighth bit in first octet is local bit if L is 1 it's locally assigned

5

Loopback Address

::1 aka localhost can be used to verify Ipv6 stack is operating on a device

6

Unspecified Address

128 bits are all 0's :: Used for source address with sending neighbor or router a solicitation (Network advertisement for ip address of the interface) message

7

Solicited Node Multicast

corresponding to Ipv6 address in each interface of router begins with FF02::1:FF for first 104 bit, last 24 bits of Ipv6 address, used for duplicate address detection

8

How do we get the EUI address

Take Mac address and use it to scale to 64 bit:
Split down middle, insert FFFE in the middle
Convert second hex to binary and flip the 7th bit

9

IPv6 Addresses have

Interface ID
Subnet
Global Routing Prefix

10

What does dual stack mean

when you run IPv4 and IPv6 on a network

11

Interface ID always occupies the ___ of a Ipv6 address

Last 1/2 or 64 bits

12

Class A address has range of

1-126 Default mask /8

13

Class B address has range of

128-191 Default mask /16

14

Class C address has range of

192-223 Default mask /24

15

Class D address is used for ___ and has a range of __

multicast, 224-239

16

Class E address is used for ___ and has a range of ___

experimental purposes, 240-255

17

Private address ranges

A: 10.0.0.0 - 10.255.255.255
B: 172.16.0.0 - 172.31.255.255
B: 169.254.0.0 - 269.254.255.255
C: 192.168.0.0 - 192.168.255.255

18

What's CDP

Cisco Discovery protocol, layer 2 shows information of CDP adjacent devices

19

What destination mac address does CDP send to

multicast 01-00-00-0C-CC-CC-CC

20

How do you show neighbors in CDP

show cdp neighbors

21

What's LLDP also known as

IEEE 802.1AB

22

What's the command to know LLDP's neighbors

show lldp neighbors

23

How do you enable LLDP

lldp run

24

What are the steps to booting up a router?

1. POST (Power on self test)
2. Execute bootstrap code to locate and load iOS
3. Locate Cisco iOS software
4. Load Cisco iOS Software
5. Locate Configuration in NV ram
6. Load into running-config
7. Execute Configuration

25

Configuration Register

16 bit value = 4 hex, last value is boot field (4 bits)

26

What are the different configuration options

0x0 = boot into ROM Monitor Mode
0x1 Boot first image in flash
0x2 - 0xF Get image loading instructions from configuration in NVRAM

27

How do you show a router's license?

#show license

28

How do you install a router's license

license install (location of xml file)

29

What does ping send?

Sends ICMP echo request and listens for an ICMP echo reply back ICMP = internet control message protocol or basically troubleshooting message

30

How do you trace a router

#trace ip (dest ip) will send a UDP message with incorrect dest port number packet times out at each router and ip is returned