Question 46
What is the primary purpose of Reverse Address Resolution Protocol (RARP)?
RARP was used by diskless workstations during bootup to discover their own assigned IP address by broadcasting their known MAC address.
What is the primary purpose of Reverse Address Resolution Protocol (RARP)?
RARP was used by diskless workstations during bootup to discover their own assigned IP address by broadcasting their known MAC address.
Which ICMP message is sent to a source host when a router encounters a packet whose TTL expires in transit?
When an IP packet's TTL drops to 0, the router discards the datagram and returns an ICMP Type 11 (Time Exceeded) message to the source, utilized by traceroute.
In distance vector routing protocols, what technique prevents a router from advertising a route back out the same interface through which it was learned?
Both Split Horizon and Poison Reverse are distance-vector loop-prevention techniques. Split Horizon suppresses an advertisement back toward the interface from which it was learned; Poison Reverse advertises that route back with an infinite metric.
Which dynamic routing protocol organizes an Autonomous System into hierarchical areas with Area 0 functioning as the mandatory backbone area?
OSPF uses a 2-tier hierarchy where all non-backbone areas connect directly to Area 0.0.0.0 (Backbone Area) via Area Border Routers (ABRs).
What is the standard port number assigned to the Domain Name System (DNS) for query resolution?
DNS operates on port 53, using UDP for standard fast queries and responses under 512 bytes, and TCP for zone transfers and large responses.