Network stuff… PT. 2!

Ok so apparently I dont know any thing about networking, I was aware of this but its worse than I thought. Which, honestly, is great because I love learning new things so this may take longer than expected. Who knows though, maybe ill have it done by the end of the year.

Single media? This a cable type? I’m totally confused. I guess I should do that thing where I type out what each of the answers are.

Answers
• multimode- While multimode means the fiber can propagate multiple modes. The difference between single mode and multimode fiber mainly lies in fiber core diameter, wavelength, light source and bandwidth.
• Single mode- (a type of fiber optic cable) Single mode means the fiber enables one type of light mode to be propagated at a time.
• cat 5e- a 5 pair networking cable
• cat 6e- a 6 pair networking cable

Also this exists Single/multi mode fiber

This is really not that hard but you see, the thing is, I’m not very familiar with ports. Anyway, here is a chart.

ports
• 20- File Transfer Protocol (FTP) Data Transfer
• 21- File Transfer Protocol (FTP) Command Control
• 22- Secure Shell (SSH)
• 23- Telnet – Remote login service, unencrypted text messages
• 25- Simple Mail Transfer Protocol (SMTP) E-mail Routing
• 53- Domain Name System (DNS) service
• 80- Hypertext Transfer Protocol (HTTP) used in World Wide Web
• 110- Post Office Protocol (POP3) used by e-mail clients to retrieve e-mail from a server
• 119- Network News Transfer Protocol (NNTP)
• 123- Network Time Protocol (NTP)
• 143- Internet Message Access Protocol (IMAP) Management of Digital Mail
• 161- Simple Network Management Protocol (SNMP)
• 194- Internet Relay Chat (IRC)
• 443- HTTP Secure (HTTPS) HTTP over TLS/SSL

So yeah, I guess i should know those. Maybe. I cant even name all the tracks on my favorite album, Transylvanian Hunger.

I hate the OSI model. Its the worst thing in the entire world. Like, never mind. I mean, its not that bad. I just don’t understand it that well and I have spent two hours reading trying to find some sort of proof of concept that encapsulation is removed as traffic is pulled through the layers and I can find no evidence of this. Honestly, I should probably buy a book on the OSI model and actually read it, however, I’m not exactly sure that I have time for that. Regardless, I might still purchase to peruse and pretend that I’m educated on the books contents by pointing at it while smoking a pipe and wearing a robe, clearly entrenched in another book as people enter my domicile. For the time being I’m not going to say much about about this other that I have accept this as fact but I have learned some things about the OSI model so for now im going to chaulk that up to a sucess.

In case I forgot, lets go over this again:

DNS records
• A (Host address)- It is used to translate human friendly domain names such as “www.example.com” into IP-addresses such as 23.211.43.53
• AAAA (IPv6 host address) An AAAA-record is used to specify the IPv6 address for a host (equivalent of the A-record type for IPv4).
• ALIAS (Auto resolved alias) ALIAS-records are virtual alias records resolved by Simple DNS Plus at at the time of each request – providing “flattened” (no CNAME-record chain) synthesized records with data from a hidden source name.
• CNAME (Canonical name for an alias) the computer “computer1.xyz.com” may be both a web-server and an ftp-server, so two CNAME-records are defined: “www.xyz.com” = “computer1.xyz.com” and “ftp.xyz.com” = “computer1.xyz.com”.
• MX (Mail eXchange) MX-records are used to specify the e-mail server(s) responsible for a domain name.
• NS (Name Server) NS-records identify the DNS servers responsible (authoritative) for a zone.
• PTR (Pointer) PTR-records are primarily used as “reverse records” – to map IP addresses to domain names (reverse of A-records and AAAA-records).
• SOA (Start Of Authority) The host name of the primary DNS server for the zone.
• SRV (location of service) SRV-records are used to specify the location of a service. They are used in connection with different directory servers such as LDAP (Lightweight Directory Access Protocol), and Windows Active Directory, and more recently with SIP servers (see https://simpledns.com/kb/112).
• TXT (Descriptive text) often used to hold general information about a domain name such as who is hosting it, contact person, phone numbers, etc.

This is confusing because there are a million things this could be and DNS would be the last thing I would check. A,C and E are also plausible candidates. If the test has questions like this that are not on pretest stuff that sucks haha. Also, im taking for granted that they are logging into an AD domain. Honestly, I did some research and this seems like the least likely answer and I’m going to just go with it. The only way that this could be possible would be a firewall issue between the DC hosting DHCP and the clients. DNS causing login failures to connect to a DHCP server and thus domain authentication seems kind of far fetched, but ok.

I’m not even sure what a broadcast domain is so lets start there.

Broadcast domain- A broadcast domain is a logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer. A broadcast domain can be within the same LAN segment or it can be bridged to other LAN segments.

So like a VLAN? Anyway, after looking at this I realized that this was easy af. broadcast domain

I guess that’s all for the night, off to the gym.