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CISCO ICND 1 Subnet

Cisco ICND 1 Subnetting (TTC)

QuestionAnswer
When Octet Value= 0 How many bits are set to 1? Bits set to 1 in Octet= 0
When Octet Value= 128 How many bits are set to 1? Bits set to 1 in Octet= 1
When Octet Value= 192 How many bits are set to 1? Bits set to 1 in Octet= 2
When Octet Value= 224 How many bits are set to 1? Bits set to 1 in Octet= 3
When Octet Value= 240 How many bits are set to 1? Bits set to 1 in Octet= 4
When Octet Value= 248 How many bits are set to 1? Bits set to 1 in Octet= 5
When Octet Value= 252 How many bits are set to 1? Bits set to 1 in Octet= 6
When Octet Value= 254 How many bits are set to 1? Bits set to 1 in Octet= 7
When Octet Value= 255 How many bits are set to 1? Bits set to 1 in Octet= 8
When Subnet Mask= 255.0.0.0 What is the prefix notation? Prefix Notation= /8
When Subnet Mask= 255.255.0.0 What is the prefix notation? Prefix Notation= /16
When Subnet Mask= 255.255.255.0 What is the prefix notation? Prefix Notation= /24
Class A IP 1-26 (first octet)
Class B IP 128-191 (first octet)
Class C IP 192-223 (first octect)
When Prefix/ CIDR Mask= /30 How many hosts per Subnet? Host Per Subnet= 2
When Prefix/ CIDR Mask= /29 How many hosts per Subnet? Host per Subnet= 6
When Prefix/ CIDR Mask= /28 How many hosts per Subnet? Host Per Subnet= 14
When Prefix/ CIDR Mask= /27 How many hosts per Subnet? Host Per Subnet= 30
When Prefix/ CIDR Mask= /26 How many hosts per Subnet? Host Per Subnet= 62
When Prefix/ CIDR Mask= /25 How many hosts per Subnet? Host Per Subnet= 126
When Prefix/ CIDR Mask= /24 How many hosts per Subnet? Host Per Subnet= 254
When Prefix/ CIDR Mask= /23 How many hosts per Subnet? Host Per Subnet= 510
When Prefix/ CIDR Mask= /22 How many hosts per Subnet? Host per Subnet= 1022
When Prefix/ CIDR Mask= /21 How many hosts per Subnet? Host Per Subnet= 2046
When Prefix/ CIDR Mask= /20 How many hosts per Subnet? Host Per Subnet= 4094
2^h - 2= Hosts Per Subnet h= host bits (number of 0's left over in the 32 bit binary address)
2^s= Subnets Created s=the borrowed bits
2^0= 1
2^1= 2
2^2= 4
2^3= 8
2^4= 16
2^5= 32
2^6= 64
2^7= 128
2^8= 256
2^9= 512
2^10= 1024
2^11= 2048
2^12= 4096
How many host IP's are practical in a modern network for Ethernet LAN's and VLAN's? 254
How many host IP's are practical in a modern network for Wireless LAN's? 30-62
How many host IP's are practical in a modern network for Point to Point WAN's? 2
How many host IP's are practical in a modern network for Point to Point Ethernet connectivity between routers? 2
How many host IP's are practical in a modern network for Multipoint WAN's? 6-30
How many host IP's are practical in a modern network for Publicly addressed servers in a DMZ? 6-254
Addressing when you stick with default subnet mask? Classfull (ex. /8, /16, /24)
When a subnet mask is aplied other than the default subnet mask's of /8, /16, /24? Classless
Subnets created when 1 Bit is Borrowed 2
Subnets created when 2 Bits are Borrowed 4
Subnets created when 3 Bits are Borrowed 8
Subnets created when 4 Bits are Borrowed 16
Subnets created when 5 Bits are Borrowed 32
Subnets created when 6 Bits are Borrowed 64
Subnets created when 7 Bits are Borrowed 128
Subnets created when 8 Bits are Borrowed 256
The progression between the subnets Block Size
What are the two ways to get the Block Size of a Subnet? 1. Look where the last "1" in an octet is. The block size is the binary value. 2. Subtract the interesting octet from 256.
What layer of the OSI model is a Router? Layer 3
What layer of the OSI model is a Switch? Layer 2
Switches provide what? 1. VLANs to separate users, servers, and stations 2. High Speed Connectivity 3. Redundant Connectivity
Routers provide what? 1. Transporation of Packets across different networks 2. WAN and LAN Connectivity 3. Enforcement of Perimeter Security
Fa is? FastEthernet- 100mbps
Gi is? Gigabit Ethernet- 1000 Mbps or 1 Gbps
Te is? 10 Gigabit Ethernet- 10 Gbps
S is? Serial WAN link – 64kbps- 2 Mbps
Which port is used to manage Cisco Routers and Switches? Con0 (Aux0 only on Routers)
What kind of cable is used to manage Routers and Switches? Roll Over Cable
What are the Primary VPN Technologies 1. IPsec 2. Secure Sockets Layer (SSL) also know as Web VPN
What are Logial Topologies? Logical paths that the signals use to travel from one point on the network to another.
Describe Bus Topology all devices receive the signal. They always need a terminator to eventually kill the signal.
Describe Star Topology all transmission are through a central point, it has a single point of failure
Describe Extended-Starn Topology Like the Star Topology but you add a middle layer to make the topology more scalable
Describe Ring Topology signal travels around a ring, massive single point of failure
Describe Full-Mesh Topology is highly fault-tolerant, and expensive to implement
Describe Partial-Mesh is the trade –off between fault tolerance and cost
What is DoS Denial of Service, when someone removes a service to deny service
What is DDoS Distributed Denial of Service like DoS but a collection of hackers to attack one spot
What are the Layers in the OSI model? Start at Layer 1. 1. Physical 2. Data Link 3. Network 4. Transport 5. Sessions 6. Presentation 7. Application
Created by: dacheeves