IPv4 for (100-105) CCENT CCNA

[deanwebb]

IPv4 for (100-105) CCENT CCNA

How is ICMP different from TCP and UDP?
What ICMP function includes "echo request" and "echo reply" packets?

What protocols go with the following...
TCP 21
TCP 22
TCP 23
UDP 53
TCP 80
TCP 443

In TCP/IP, the network access layer combines which two OSI layers?

What are the differences between FTP and TFTP? What are the similarities?

What are the differences between telnet and SSH? What are the similarities?

If a host at 10.1.2.3 makes a HTTP connection to 172.16.1.1, using port 34567 as the source port...
What is the source port of the reply traffic?
What is the destination port of the reply traffic?
What is the source IP of the reply traffic?
What is the destination IP of the reply traffic?

What protocol does a device use when it requests an IP address?
What commands need to be on a switch in order to send IP address requests to a server not directly connected to the switch?

Which of the following are typically TCP, and which are typically UDP? (BONUS: What ports do they use?) FTP, TFTP, SSH, Telnet, DNS, SMTP, SNMP, HTTP, HTTPS, PING

A workstation sends a DNS request and a HTTPS request. Which of those requires that a TCP session be established?

Does TCP or UDP provide sequence numbering of packets? Why?

What transport protocol is associated with best-effort delivery and is connectionless?

Consider the IP address, 10.0.3.27/22. What is the subnet mask? What is the lowest IP address in that network range? What is the highest IP address in that network range?

SUBNET MASK FUN TIME!
What are the dotted-decimal subnet masks for the following networks:
/16
/17
/18
/19
/20
/21
/22
/23
/24
/25
/26
/27
/28
/29
/30

An admin wants to break up a /24 netwokrk into equal-sized parts to service four branch offices in the same region.
What subnet mask will divide the /24 into four equal parts? Show it in both slash and dotted-decimal format.
What is the maximum number of hosts per subnet as described above?

At a large site, administrators assign the IP range of 10.44.120.0 /20 for the wireless devices at that site. What is the maximum number of IP addresses available to assign to devices in that range? What is the lowest possible address and what is the highest possible address in that range?
How many IP addresses are available in a /21 network? A /22 network? A /23 network? A /24 network? A /25 network? How about a /26 and a /27 network? Might as well put down the number of hosts in a /28, /29, and /30 network, as well. (Bonus question: is there such a thing as a /31 network? What's up with that?)

How many /30 networks can be subnetted from a /24 range?

What two protocols would PuTTY possibly use to connect to a remote network device?

Define the following terms as they are used in NAT:
Inside Local:
Inside Global:
Outside Local:
Outside Global:
Once NAT is set up, the interface that connects to the Internet on the Internet router will have an address in which of the above four categories? What about a device with an RFC 1918 address on the internal network - how is the RFC 1918 address classified?

What two router commands would be used to configure NAT for outbound traffic on interface Serial0/0/0, the Internet-facing interface?

What two router commands would be used to configure NAT for inbound traffic on interface Gi0/0, the internal-facing interface?

What NAT limitation does PAT help to overcome? What parameter in a NAT statement will enable PAT?