Chapter 2 - Domian 2 Network Installation and Configuration Flashcards
Why would you want to create a static route in a routing table?
page 61
When there is only one main location to access or send files, for example printers, video, etc.
What is a NAT & what is it used for?
page 61
Network Address Translation
- translates one set of IP addresses to another set of IP addresses.
- Often used between private network & the Internet.
What is PAT & what is it used for?
page 61
Port Address Translation
When 2 or more PCs share one external address to keep their network communication channels separate.
`PAT appends it by using a specific port number.
What are managed & unmanaged devices?
page 63
- Unmanaged devices - devices that require no configuration, they configure themselves.
- Managed devices - required specific configuration.
What are the five Interface Configurations?
page 63
Full Duplex - device that can send & receive at same time.
Half Duplex - device that can only send or receive at one time.
Port Speeds - the speed at which most NICs, Switches, ports can use (10Mbps, 100Mbps, 1000Mbps…)
IP Addressing - commonly used IPv4
MAC Addressing - 48-bit hexadecimal, usually applied where the host PC are connected to switches.
What is VTP & what does it do for you?
page 65
VLAN Trunking Protocol
A protocol that is proprietary to Cisco & allows you to create a switch with the role of “Server” that you can configure with your VLAN info.
How does QoS make use of the bandwidth more efficient & effective?
page 66
- Network technique that divides traffic into categories based on the protocol of the traffic.
- Allows for prioritization of each category.
- Priority traffic get preference than general traffic.
How is Port Mirroring accomplished?
page 66
- Monitoring all traffic that VLAN separates for security reasons.
- Gets copy of network packets from one switch port, sent to another switch port.
- Uses Intrusion Detection System/Intrusion Prevention System (IDS/IPS) to do the monitoring.
Why should you take into account of the distance between client & Wireless Access Points (WAP)?
page 67
Could affect the power of intended signal & make interference from other signals more pronounced.
What are some cause of Interference on a Wireless network?
page 68
- Bluetooth, keyboards, mice
- Cell phones
- Microwave ovens
- Electric motors
- Mundane appliances such as refrigerators.
What are channels & which are commonly used and why?
page 68
A combination of frequencies (typically the 2.4GHZ or 5GHz band) that can be used by the end user.
- WAPs & clients must be on the same channel
- Most likely use channel 1, 6 or 11, these channels are non-overlapping, therefore leas likely to interfere with each other.
What types of modulation do each wireless standard use?
page 69
- 11a - OFDM (Orthogonal Frequency Division Multiplex)
- 11b - DSSS (Direct Sequence Spread Spectrum)
- 11g - OFDM/DSSS
- 11n - OFDM/DSSS
What types of devices should have static IP addresses?
page 70
- Servers
- Network printers
- Plotters
- Router interfaces
- Any device that needs to be statically configured so their addresses do not change
What are Reservations?
page 71
- DHCP give Random addresses
- Clients that receive the same address based on their MAC Address
How should you manage your scopes?
page 71
- Scopes are a range of addresses that can be assigned to clients.
- Scopes should be based on IP subnets.
- Scope addresses should not overlap other addresses in other scopes to prevent IP address conflicts.
How long are leases by default?
page 72
- Lease is a defined period that the IP address assigned can be used.
- Default is 8 days
- Clients will attempt to renew leases after 50% of time has expired.
What is a switching loop & what is used to prevent these loops?
page 76
- Switch will send communication signals out on all the ports except the one that they came in.
- Two or more switches connected with multiple links can cause a loop of common signals.
- Spanning Tree Protocol (STP) is used to prevent these loops.
Why should port configuration be one of your primary “suspects” when troubleshooting a router or switch?
page 77
- Both switches & routers have interfaces, referred to as “physical ports”
- Most mis-configuration is the speed of the link
- Others are type, protocol, duplex whether open/shut
- Which could lead to improper port configuration.
What is MTU?
page 77
Maximum Transmission Unit
- Defines the largest size packet that will be expected by a network.
- Range, 64 bytes to 1518 bytes
- Improper configured router can consistently drop packets, that would be otherwise forwarded.
- Effect - user unable to get to some websites
- Router causing this, sometimes referred to as Black Hole.
What are SFPs & GBIC & how do they affect telecommunications?
page 78
SFP = Small Form Factor Pluggable
- Is a compact, hot pluggable transceiver that is used for both telecomm & data communications
GBIC = Gigabit Interface Connector
- Is a hot swap interface that is the common standard for Gigbit Ethernet & Fibre Channels
BOTH ARE FRUs
Why is the correct subnet mask important?
page 78
Connection will fail, even if you are pinging the RIGHT Ip address if the subnet mask is not properly configured.
How does Duplicate IP addresses occure?
page 79
- Manual misconfigurations of computers, router interface, DHCP scope
- To fix, reassign one of the addresses to make them unique
What are a list of requirements for SOHO?
page 80
- Fewer 10 PCs
- Connection via cables, switch, wireless connector
- Internet Connection
- Printers, faxes, scanners etc
