Practice test notes
Db – need a high enough strength depending on connection(outside or inside) connecting two buildings
or between two offices within a building
Parabolic – focuses direction to one point
Omnidirectional – evenly distributed to all sides.
Subnet masks:
Class a: 1.0.0.0 to 126.0.0.0
Class b: 128.0.0.0 to 191.255.0.0
Class c: 192.0.1.0 to 223.255.255.0
CIDR notation: classless inter-domain routing – a compact representation of an IP address and its
associated network masks.
Types of cables:
Network Address Translation(NAT): Protects the identity of a network and doesn’t show internal IP
addresses to the internet.
Protocols
Time-Domain Reflectometer used to determine exactly where in the cable a break has occurred.
DHCP requirements: default gateway, DNS server, subnet mask must be provided to each client to be
able to access internet.
DHCP Reservation: when a client requests an IP address by sending a message on the network to the
DHCP server, the DHCP server will assign an IP from its DHCP scope to the client and reserve it based on
its MAC address.
DHCP Relay: any host that forwards DHCP packets between clients and servers. Relay agents forward
requests and replies between clients and servers when they are not on the same physical subnet.
Hardware failure
MAC filtering – restricts access to only certain devices
802.11 networks
Spectrum analyzer tool: a device that displays signal amplitude(strength) as it varies by signal frequency.
Causes for network interruptions:
Latency
Throttling
Interference
Split horizon
Commands:
Ping vs traceroute
Netstat
Pathping
Tcpdump
Access point isolation – a technique for preventing mobile devices connected to an AP from
communicating directly with each other.
QoS = Quality of Service
OSI Layers
1 – Application
2 – Presentation
3 – Session
4 - Transport
3 – Network
4 – Data
5 – Physical
SSH Configuration requirements : ensure key is established between client and server, enabled on
router, allows access from all subnets.
ATM(Asynchronous Transfer Mode) Networks – connection oriented networks for cell relay that
supports voice, video and data communication. The size of an ATM cell is 53 bytes
