ISM 4220 Test 2
What 3 Wi-Fi channels do not overlap frequencies?
1,6,11
What is the maximum transmission speed of 802.11ac with MIMO?
1.3Gbps
What is the expected coverage area of an access point?
10 Meters
How long is a IPv6 address?
128bits
How many root DNS nodes are there in the world?
13
Wi-Fi operating at 5GHz has a maximum channel size of?
160MHz
With a signal strength of 30mW from 5 meters, what is the expected strength at 15 meters from the source?
3.33mW
With an IPv4 address that has a 16 bit network segment, what size subnet would you need to allow over 1000 hosts per subnet?
6 bit
For mesh networking what wireless standard is used?
802.11
What set of standards does Wi-Fi use?
802.11
In a E-LAN, the carrier network structure is viewed as ___?
A single network of trunks and switches
List three situations where Wi-Fi central management is needed
Alarms Monitoring Updates Configuration Security (WIDS) Signal Tuning
What 2 addresses in every subnet are reserved and not available for hosts?
All 1's and 0's (1-broadcast 0-DHCP)
In one sentence, what does Wi-Fi mean?
Alliance of vendors claiming interoperability
Name the set of services that handle the primary communication tasks on 802.11 based networks?
BSS
Why do firewalls just pass along VPNs IPsec transport protected packets?
Because they are encrypted and cant be inspected
Why are bluetooth profiles needed for the application layer?
Bluetooth is hardware to hardware so the profile the application
What is the difference in an ARP request and a normal data packet?
Broadcast
Which has shared capacity for neighborhoods?
Cable Modem
Which is not part of the extended service set for access points? Handoffs Roaming Signal Strength Connectivity
Connectivity
What does Media Access Control methods help with on a Wi-Fi network?
Coordinating when devices transmit
How do router solve multiple row matches in the routing table?
Cost metric
Describe a DNS AAAA record?
DNS record linking name to IPv6 address
Why pay the premium fo a WAN connection compared to using the internet?
Dedicated throughput with segregated traffic
What is the carrier ethernet of a leased line for site to site transfers?
E-Line
In IPv4 header what field is used for changing the rate of transmissions between a pair of hosts?
ECN - Explicit Congestion Notification
Why are ongoing site surveys needed in wireless networks?
Ensure no environmental changes
Access points connect wireless devices to ?
Ethernet LAN
What is ICANN in charge of?
Global DNS registration
Provide an example of when a bluetooth master/slave setup flips?
Hanging up a bluetooth headset
What is missing from hardware that does not support IPv6?
Has only IPv4 stack, no dual or IPv6 stack
Radio frequency is measured in?
Hertz
What number system is used to write a IPv6 address?
Hex
What was the result of TJX not being forthcoming with the breach info?
Higher fines
This organization is responsible for IP assignments:
IANA
ICMP can be used to notify routers of unreachable hosts, but it poses a security risk. Why?
ICMP packets expose the host address even through NAT
What information is in the DNS response?
IP address
The primary difference of VPN technologies is ___ VPNs work on layer 3 of the network, and ___ works on layer 4 of the network.
IPsec SSL/TLS
Name 2 types of VPNs:
IPsec & SSL/TLS
Describe the ideal VPN setup for a single remote user to access company resources?
IPsec transport mode from the host terminating at the company gateway
An IPv4 or IPv6 address can be abbreviated (either or both)
IPv6 only
If the destination host is on the local subnet, what is listed as the next-hop router?
Local
Why is carrier Ethernet growing so fat? List 2 reasons.
Lower equipment cost Less learning curve for admins Agility in connection speed & settings Simple extension of LAN
What type of connections are most cell towers connected too?
MAN connections
The information set and formal are both known as?
MIB
What protocol was developed to help router efficiency?
MPLS- Multi Protocol Label Switching
Cell towers connect to ___ for handling calls and inter-tower handoffs?
MTSO- Mobile Telephone Switching Office
What creates the largest amount of interference in Wi-Fi signals?
Multipath Interference
Name the technology that converts external sockets to internal sockets allowing multiple hosts behind a single global address.
NAT
Of all the PAN technologies we studied, which relies on only distance for security?
NFC
How does the IP stack know where the IPv6 header extensions end?
Next header value
Bluetooth uses a master/slave setup where one controls the other. Does the connection need to reset for that relationship to flip?
No
Can a single access point handle the needs of 100 employee company?
No
In a carrier ethernet segment, is cryptography an option?
No
In an IPv6 address, is the host segment variable in size?
No
Why is a VPN tunnel simpler than using transport mode?
No host configuration
Why is there a limit to the size of a UDP transfer?
No segmentation support
Which antenna type wastes more signal: Dish or Omni Directional?
Omni Directioal
Wi-Fi and Cellular mostly use which type of antenna: Dish or Omni Directional?
Omni Directional
What technology is used to fragment Wi-Fi frames during transmission?
Orthogonal Frequency Division Multiplexing
What is the primary distinction between LAN and WAN?
Ownership
What is the primary difference in border and internal routers?
Ownership of the network getting interfaced with.
What type of network is designed for short range, device to device networks such as bluetooth or NFC?
PAN
In addition to monitoring, what can SNMP be used for
Pick One: Alerting Configurations Dynamic Actions
Give an example of Wi-Fi direct in use?
Printers
What is the number one issue with Wi-Fi networks?
Propagation Issues
Why is wired more reliable?
Propagation Issues
What does PSTN stand for?
Public Switched Telephone Network
In the IPv6 header what is the traffic class used for?
QoS and congestion notification
What is the drawback to decision caching?
Rapid changing environments can leave stale records causing delays.
In TCP, what is an RST packet for?
Rest or abrupt close
What is the difference in a rogue access point and an evil twin access point?
Rogue just duplicates SSID, ET is complete AP impersonation and replacement
What is the primary use of subnet masks?
Route decision making
What is the BGP protocol used for?
Routing traffic across the network border
What level domain name is typically purchased for a business?
Second Level
Why does the acknowledgement number not equal the sequence of the packet its reporting on?
Security
As a network administrator what would you use the subnet portion of your IP range for?
Segmenting hosts, dividing the network, or separating traffic.
Defined radio signal ranges used for a specific purpose, such as FM, are known as?
Service Band
What makes drive by hacking illegal?
Snooping traffic and accessing systems
Why is there a default row in the routing table?
So only IP ranges with special routes need to be listed
What technology is used to help with Multipath Interference?
Spread Spectrum
What is the difference in how a router (layer3) and a switch (layer2) operate?
Switches match the IP to the destination EUI-48 from ARP to pass traffic around a single network. Where a router interfaces multiple networks and compare destination IP subnet with routing table to determine which network it should be forwarded to.
What is the most well known global WAN?
The internet
What is the power source for a RFID tag?
The scan charges the tag
Why do IPsec and VOIP have trouble with address translation?
Thrue IP info is needed to function properly
Describe a man in the middle attack?
Traffic intercepted, keys changed, and passed on so encrypted file can be read.
Which is more secure tunnel mode or transport mode?
Transport Mode
What security feature does SNMPv3 produce?
User/Password pairs per user
What is the first field in an IP header?
Version
Residential broadband connections are a basic implementation of?
WAN
The common name for 802.11 security is?
WPA2
What is the action of driving around cataloging Wi-Fi access points, security and location?
Wardriving
What Wi-Fi security technology was TJX using before they were hacked?
Wep
What is the device needed to convert radio waves to 02.3 ethernet?
Wi-Fi Access Point
Which is more reliable wired or wireless?
Wired
Are Wi-Fi frames fragmented during transmission?
Yes
Are all messages encrypted if 802.11i security is used ?
Yes
Can your network get hacked from the parking lot?
Yes
Do higher frequency signals attenuate faster than lower frequency signals?
Yes
Does a higher humidity level impact Wi-Fi signal?
Yes
