Networking Concepts

• A router is a Layer 3 device that connects multiple computers and networks.
• A router forwards packets to the default route if the next hop cannot be determined.
• STP Cat5e cable should be used to reduce interference when running Ethernet network drops with existing interference.
• One purpose of a perimeter network is to make resources available to the Internet.
• Address Resolution Protocol (ARP) maps IP addresses to Media Access Control (MAC) addresses.
• Cat5e is the least expensive network cable option that supports at least 300 Mbps.
• A network printer and web server should be included in the perimeter network for a coffee shop setting.
• VLAN advantages:
  • Compartmentalizes a network and isolates traffic.
  • Single switch can implement more than one VLAN.
  • Gives the impression of being on the same LAN regardless of the physical location.
• DNS Server uses pointer records and A records.
• 224.0.0.1 is a multicast address.
• A North American T3 circuit has a bit rate of 44.736 Mbit/s.
• 68.24.78.221 is a public IP address.
• Routing Information Protocol (RIP) uses Hop count to determine the least costly route.
• Layer 2 and Layer 3 switches both forward packets onto the network.
• Fiber optic cable characteristics:
  • Supports splicing
  • Requires a polish for end connectors
• VPNs provide a secure connection through public networks, and additional encryptions by using IPSec.
• When manually selecting the network to connect to, uncheck "Connect automatically when this network is in range."
• WPA-Enterprise requires certificates for its encryption.

IP Address and Protocol Mapping

• TCP protocols provide connection-oriented protocol with guaranteed service
• UDP protocols provide connectionless, message-based protocol with best-effort service
• ARP resolves IP addresses to MAC addresses

Networking Nodes

• When an 802.11b node begins broadcasting within range of an 802.11g access point, a connection will be established.
• Encryption takes place on the presentation layer, according to the OSI model.
• Connecting to a private network address from a public network requires Network Address Translation (NAT).
• DNS finds a mail service using a Mail Exchanger (MX) DNS record.

IP Address Range Matching

• Loopback addresses range from 127.0.0.0-127.255.255.255
• Multicast addresses range from 224.0.0.0-239.255.255.255
• Private network addresses range from 192.168.0.0-192.168.255.255

Switch Operations

• A switch sends unicast packets to one destination port only.
• A switch floods ports if it does not know where to send a packet.

Media Access Methods

• In LAN topologies, contention and token passing are the primary media access methods.

Switch vs Hub

• Switches are capable of sending and receiving data at the same time, unlike hubs.
• Switches can identify the intended destination of data, unlike hubs.
• Every router is not solely TCP/IP enabled and no change is needed.
• Category 5e STP cable reduces external interference through shielding.
• An Internet Protocol version 6 (IPv6) address has 128 bits.

Defining a Layer 2 Device

• A switch is a Layer 2 device that connects multiple computers within a network.
• Multilayer switches provide Layer 3 routing functions in addition to switching.

Quality of Service

• QOS allows defining traffic priority and controlling bandwidth.

Wireless Network Protocols

• 802.1X handles SSL certificates in a wireless network requiring one.

Troubleshooting Internet Access

• To allow Internet access, ensure a default gateway address is configured.
• To allow website lookups, configure DNS server settings.
• Single-mode fiber transmits data the greatest distance.
• VPN connections
  • SSL VPN allows a remote user to connect to a private network from anywhere on the internet
  • Site to Site VPN securely connects two portions of a private network or two private networks
  • Layer 2 Tunneling Protocol creates an unencrypted connection between two network devices
• The maximum cable length for a single Cat5 UTP cable run is 328 feet/99.97 meters.
• The default gateway address identifies the device that will connect the computer to a remote network.
• Each hop in the trace route is a router.
• A trace route completed successfully indicates that was successful
• IPv4 Address Classes:
  • Class C corresponds to 201.111.22.3,
  • Class B corresponds to 133.234.23.2,
  • Class D corresponds to 224.100.20.3
  • Class A corresponds to 64.123.12.1
• HTTP, TELNET, FTP, and SMTP protocols operate on Layer 7 of the OSI model.
• Layer 3 of the OSI model controls routing between network devices.
• Some Important DHCP features are address reservation and IP address exclusion.
• A PING command verifies a server is connected to the network.
• The maximum throughput of an 802.11g network is 54 Mbps.
• In the star topology, each computer connects to a central point.
• WEP wireless encryption is the most susceptible to interception and decryption, no change is needed.
• When a client computer can't reach a DHCP server, it automatically assigns an IP address in the 169.254.0.0-169.254.255.255 range.
• RJ-45 connector is used on a 100BaseT Ethernet cable.
• Hardware addresses are referenced in the Data link layer in the OSI model.
• Characteristics of a mesh network topology:
  • Fault tolerant because of redundant connections.
  • Every node connects to every other node on the network.
• To protect a network when it's connected to the Internet, you should use a Firewall.
• TTL indicates the length of time that other DNS servers use to determine how long to cache information for a record before expiring and discarding it.
• The loopback address of your computer is 127.0.0.1, no change is needed.
• To restore access to network resources with a 169.254.48.97 IP address, verify that the DHCP service is available.
• The correct term is Zone transfer.
• A tracert command displays router addresses that are traversed between a source and a destination.
• HTTPS encrypts packets on the Internet.
• If a computer with an IP address of 169.254.0.1 cannot access the network confirm DHCP is available.
• Domain Name Service (DNS) is the service that resolves fully qualified domain names (FQDN) to IP addresses.
• Internet Key Exchange (IKE) is responsible for negotiating algorithms to use and exchanging key information.
• The node transmits, but the access point is unable to receive when an 802.11a node broadcasts within range of an 802.11g access point.
• Connectivity options for wide area networks (WANs) listed includes Dial-up and Leased line.

Key TCP ports

• SMTP's port is 25.
• FTP's port is 21.
• HTTP's port is 80.
• HTTPS's port is 443

Characteristics of 802.11a

• Frequency range: 5.1-5.8 Ghz
• Data rate: 54 Mbps

Characteristics of 802.11b

• Frequency range: 2.4-2.485 Ghz
• Data rate: 11 Mbps

Characteristics of 802.11g

• Frequency range: 2.4-2.485 Ghz or 5.1-5.8 Ghz
• Data rate: 54 Mbps

Characteristics of 802.11n

• Frequency range: 2.4-2.485 Ghz or 5.1-5.8 Ghz
• Data rate: 65-600 Mbps
• Trunk ports support VLAN traffic between two switches.
• The command-line tool netstat lists a host's active incoming connections.
• A network administrator sets a router's static route.
• ::1 represents the Internet Protocol version 6 (IPv6) loopback address.
• 802.11g and 802.11n are published IEEE 802.11 wireless transmission standards.
• One reason to replace an unmanaged switch with a managed switch is to support multiple VLANS.
• Windows Internet Name Service (WINS) is a service that resolves NetBIOS names to IP addresses.
• Mesh topology uses redundant paths
• In Local area networks, required:
  • NIC(Network Interface Card)
  • IP address

OSI Model Layers

• HTTP, TELNET, FTP, and SMTP protocols operate on Layer 7

• Layer 4 of the OSI model controls dialogue between computers.

• Layer 3 of the OSI model controls routing between network devices.

• Point-to-Point Protocol (PPP) is a Layer 2 WAN protocol.

• A user is unlikely to receive a response as DNS is not resolving.

• Wireless networks are vulnerable to intrusion through the radio broadcast access method.

• Action Center ports to allow accessing websites are Port 80 and port 443.

• A Host (A) DNS record maps host names to addresses.

• FTP is an application layer protocol.

• netstat command displays the ports that your computer is listening for.

• A Managed switch interconnects computers in a workgroup, and is able to be remotely configured, and provides the best throughout.

• The TCP/IP and OSI models have 4 and 7 layers respectively.

• Topology and protocols determine media access method.

• All session data is isn't encrypted between all machines while using telnet.

• IPv4 multicast addresses range from 224.0.0.0 to 239.255.255.255 and so there is no change needed.

• Key Characteristics of CSMA/CD media access method

• It checks to see if a collision has been detected.

• It signals its intent to transmit on the network.

• NSLOOKUP

• Regarding IP configuration, the CIDR notation 192.168.1.1/25 refers to the configuration of 192.168.1.1 255.255.255.128.

• A primary zone is the first DNS zone to which all updates for the records that belong to that zone are written.

• The most secure wireless authentication method is WI-FI Protected Access (WPA)

• Trusted Sites

• Valid Subnet Mask

• 255.255.255.240

• telnet

• Where does routing occur

• Network

• DHCP not functioning

• 169.254.1.15

• Two companies are sharing data

• Extranet

• In a corporate LAN without user action to connect

• DirectAccess

• Display of Client Address

• ipconfig

• Problems connecting to the internet, possible electromagnetic interference

• D. Electromagnetic interference (EMI)

• alias name of another address record in DNS is

• CNAME

• Tracert Packet Tracing

• C. Report the route taken by packets across an IP network.

• for automatically assigning IP addresses.

• DHCP Determine media and speed

• D. Topology and protocols

• -Telnet Encrpytion Type

  • A. Not encrypted

• ipv4 address for multicast C. 224.0.0.0 to 239.255.255.255

• Collision detection CSMA with CD A. It checks to see if a collision has been detected. C. It signals its intent to transmit on the network.

• Name Settings Domain

• B. NSLOOKUP

• 192.168.1 notation

• E. 192.168.1.1 255.255.255.128

• Domain configuration

• A. Primary zone

• highest wireless security? -C. WI-FI Protected Access (WPA) Lowest secure site -B. Trusted Sites Valid bitmask? A. 255.255.255.240

• telnet

  • A. 23

• OSI Router

  • B. Network no DHCP
  • A. 169.254.1.15 shred Data -extranet LAN - No action, Corporate

• direct access

• VPN- not secured

• ping results

• did not return unknown

• TCP/IP has how many layers

  • 4

• Ethernet network standard cable

  • B. Category 5 UTP cable Direct Ethernet network cable, use
  • A. Crossover cable.

• Match OSI Layers

• Correct answers indicated by bold

OSI Model -Answer Area Data Link

• It ensures that reassembled bits are in the correct order, and it requests retransmission of frames if an error occurs. Switches and WAPs operate on this layer. Network
• It is responsible for path determination and delivery of packets, but does not guarantee delivery. ICMP, RIP, and ARP operate on this layer.*" Session +It controls dialogue between source and destination nodes. RPC and NETBIOS operate on this layer. Application
• It provides network services directly to the user's application. TELNET, SMTP, and NTP operate on this layer.*" WAN T3 -A. Network Policy and Access Services
  • B. Routing and Remote Access Service Max cable
• 100m
• no DHPC- DHCP, the clients will not be able to obtain their leases from the server.
• Is IPV4 consists of 64
• • B. FALSE 8 bits names
• TRUE
• not 256 - FALSE
• transfer protocol
  • UDP

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• if Router does not work with DHPC leases . B. Be unable to obtain their leases from the server. 64 bits FALSE

• Determine the network portion of a host address. • Self-test a host's own network interface. •SO

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