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Network+ > Supporting IPv4 and IPv6 Networks > Flashcards

Supporting IPv4 and IPv6 Networks Flashcards

1
Q

DHCP

A

Dynamic Host Configuraton Protocol

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2
Q

netsh

A
  • Command to configure network adapter interfaces
  • netsh interface IP set address “ethernet” dhcp
  • net interface IP set address “ethernet” static 10.1.0.1 (IP address) 255.255.255.0(subnet mask) 10.1.0.254(default gateway)
  • All changes made are persistent(stick around through reboots)
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3
Q

ipconfig/all

A
  • displays complete TCP/IP configuration paraments for each interface
  • included whether DCHP is enabled and the MAC address
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4
Q

inconfig /renew “interface”

A
  • Forces DHCP client to renew lease for IP address
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5
Q

inconfig /release “interface”

A
  • Releases IP address obtained by DHCP server so that interfaces no longer have IP address
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6
Q

ipconfig /displaydns

A
  • displays DNS resolver cache
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7
Q

ipconfig /flushdns

A
  • Clears DNS resolver cache
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8
Q

ipconfig /registerdns

A
  • Registers host with DNS server (if it supports dynamic updates)
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9
Q

ARP

A

Address Resolution Protocol

  • used by hosts to determine which MAC address goes to which IP address on local network
  • Cached in ARP table
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10
Q

ARP Utility

A
  • Used to perform functions related to ARP table cache

- Used to diagnose suspected problems with local addressing and packet delivery

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11
Q

arp -a

A
  • Shows ARP cache contents
  • use with “IPAddress” to view ARP cache for specific interface only
  • There will be no cache entry for hosts that have not had a recent exchange of frames
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12
Q

arp -s IPAdress MACAddress

A
  • Adds an entry to the ARP cache.
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13
Q

arp -d *

A
  • Deletes all entries in ARP cache

- Can also be used with IPAddress to delete single entry

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14
Q

ICMP

A

Internet Control Message Protocol

  • Used to report errors and send messages about the delivery of a packet
  • Generated under error conditions in most unicast traffic
  • Can also be used to test connectivity on IP networks
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15
Q

Ping

A
  • Sends a configurable number and size of ICMP request packets to destination host
  • Milliseconds on reply measure Round Trip Time and can be used to diagnose latency problems
  • 4 or -6 looks for Ipv4 or v6
  • -t starts continuous ping
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16
Q

UPS

A

Uninterruptable power supplies

17
Q

Ping Sequence for connectivity issues

A
  1. Ping loopback address to verify TCP/IP
  2. Ping IP of local host to verify network adapter
  3. Ping default gateway to verify it is up and running and you can communicate with other host on network
  4. Ping other local hosts to verify local links and configuration
  5. Ping remote host to verify communication through router
18
Q

Canonical notation

A
  • Means of compressing IPv6 addresses
  • A double byte with leading 0s can be ignored
  • One continuous series of 0s can be replaced with double colon place marker
  • Double colon compression can only be used once in a given address
19
Q

netsh interface ip show config

A
  • reports ip configuration
20
Q

get-netadapter/get-netIPaddress

A
  • Powershell cmdlets to query interface configuration
21
Q

netipaddress

A
  • Powershell cmdlet to set new configuration
22
Q

set-netipaddress

A
  • Powershell cmdlet to modify existing interface configuration
23
Q

ipconfig

A 
- displays: 
IP address
Subnet Mask
default gateway
- for all network interfaces to which TCP/IP is bound
24
Q

ip neigh

A
  • Linux command to show entries in local ARP cache
25
Q

Duplicate IP

A
  • can be caused by configuration error
  • Both hosts will contend to receive traffic
  • To solve, obtain MAC addresses of both interfaces using ping and arp-a(or arping in linux)
  • Then configure each host for unique addresses
26
Q

Duplicate MAC

A
  • Both hosts will contend to respond to ARP queries
  • Could be sign of spoofing attempt
  • Use arp utility to verify MACs and ipconfig or IP neigh to check MAC assigned to interface
27
Q

Multicast Flooding

A
  • At layer 2, if switch is not multicast aware, it will treat it as broadcast and flood across all ports
  • Consumes bandwidth
  • IGMP snooping can be enabled which determines if hosts on a VLAN have joined a multicast group
  • Multicast traffic would then be filtered from those ports and VLANS

Network+ (36 decks)

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