CNIT 34220 Exam 1 Questions With Correct Answers

Name resolution - Answer map station names back to IP addresses Host files - Answer common to both DNS host names DNS - Answer hierarchical naming system Static - Answer DNS is traditionally a __________ approach (Hard coded list of names and IP Addresses, Assumes a station always has the same IP Address, Works well with Manual or BOOTP, but not with DHCP) Hmain(s).top_level_domain - Answer DNS namespace structure 127, 63 - Answer Domains have up to _____ levels, _____ characters per domain Authority - Answer ______________ is handed down from top level to lower levels Inter Nic - Answer manages the top level (root) domains (edu, com, gov, mil, etc.) Domains - Answer map back to the names used in the DNS hierarchy (, ) Zones - Answer represent the methods used to manage domains authoritative - Answer A zone is __________________ for a domain or subdomain 2 - Answer Each second level domain must have at least ______ authoritative DNS servers Authoritative server - Answer contains actual DNS entries, must be up 24/7 Next higher level's configuration - Answer where the address for the authoritative server is listed 13 - Answer number of root name servers around the world Recursive and iterative - Answer the two approaches to forward name resolution Recursive - Answer approach to forward name resolution, an end node (resolver) sends a request to the name server is obligated to supply an IP address for a DNS name Iterative - Answer approach to forward name resolution, when the name server consults the root hints file, and it is pointed to the authoritative server name servers - Answer Resolved names are cached by _______________ TTL - Answer the amount of time that a server can hold the cached data is determined by Zone administrator - Answer who sets the TTL DNS Zone Files - Answer file for each zone containing records SOA (Start of Authority) - Answer DNS zone file, states that this is the definitive name server for the domain, uses a '.' Instead of an '@' for email NS - Answer DNS zone file, name server in the domain, identifies the name servers that are authoritative for the zone, useful for backups, needs the FQDN of the zone and FQDN of the name server A(ddress) Record - Answer DNS zone file, provides IP address of for each of the hosts that you want to make accessible via DNS MX Record - Answer DNS zone file, mail exchange, indicates that mail addressed to a domain name should be forwarded to another host, identify the mail server for a domain HINFO - Answer DNS zone file, host info record, machine type, operating system, serial number WKS (well-known service record) - Answer DNS zone file, address, protocol, and service provided by a host CNAME (Canonical Name) Record - Answer DNS zone file, stores nickname for a host, creates an alias for a FQDN TXT - Answer DNS zone file, documentation file Reverse DNS Resolution - Answer allows the DNS name of a known IP address to be resolved In-addr-arpa - Answer where information on IP address in reverse order are stored PTR records - Answer opposite of an A record, stores the FQDN for an IP address (in reverse order) Authoritative and non-authoritative servers - Answer two types of DNS servers Authoritative servers - Answer contain a persistent copy of the domain's records, primary and secondary server Primary Authoritative server - Answer DNS server that contains the master list of name information Secondary Authoritative server - Answer DNS server that acts as a backup to the primary server, copies the master list periodically (which is called a zone transfer) Non-Authoritative servers - Answer DNS caching server, slave server Non-authoritative caching server - Answer DNS non-authoritative server that refers to primary and secondary servers for info as needed, can recurse Non-authoritative slave server - Answer DNS non-authoritative server that cannot recurse To register a domain name, find a second-level domain name that is not already registered (check WHOIS database) and provide a list of at least two authoritative servers (your machines or ISP)(it registers your domain to the parent top level domain) Server 2000 (or newer) - Answer allows DNS records to be synced via Active Directory file replication service, eliminates zone transfers except for updates to non-Windows DNS servers · Compile and install BIND · Create a config file (/etc/) · Set the database directory in the config file · Define the zones served and their database files · Create the database files () - Answer How to implement BIND True - It protects internal names from external users and has better control of authority - Answer T/F: It is better to use different DNS domains for internal and external hosts .local or .lcl - Answer often used for internal domains though technically not on the Internet Packet filters - Answer a software solution that limits network connectivity based on packet characteristics (source/destination/packet characteristics), can control both ingress and egress traffic TCIP/IP stack, Application - Answer Packet filters fit into the network stack between the ____________ stack and the _______________ application - Answer Packet filter determines whether the packet can be passed to an _________________ False - all modern ones do - Answer T/F: Not all modern operating systems include some sort of packet filter router - Answer router that contains a packet filter routers - Answer In a firewall, ________________ segment networks and process each packet False - it should be dedicated (offers no other network services and should run on general purpose computers) - Answer T/F: A firewall is not dedicated software/hardware solution