CCNA Basic Interview Questions

Q-1 What type of routing protocol maintains neighbors?
Answer- Link State
Q-2 what is the range of values for administrative distance?
Answer: 0-255
Q-3 Describe the difference between unicast, multicast, and broadcast traffic?
Answer: Unicast traffic flows from a single source to a single destination MAC address. Multicast traffic flows from a single source MAC address to many destinations and uses a functional MAC address. Broadcast traffic is from a single source to all devices on the Ethernet segment. This is specified by a destination MAC address of all ones.
Q-4 What are the four different Ethernet encapsulation types?
Answer: From the Cisco IPX encapsulation command they are ARPA, NOVELL-ETHER, SAP and SNAP
Q-5 What are the three main tasks of a transparent bridge?
Answer: Learning, Forwarding, Filtering
Q-6 What type of routing protocol is EIGRP?
Answer: Hybrid
Q-7 What is the range of values for administrative distance?
Answer: 0-255
Q-8 What algorithm does OSPF use to compute its route table?
Answer: OSPF uses the shortest path first (SPF) algorithm, which is also known as the Dijkstra algorithm.
Q-9 What is a stub area?
Answer: A stub area is an area that does not accept routing updates from outside its autonomous system.
Q-10 What does the TTL field of an IP packet header do?
Answer: The TTL field indicates the maximum time that a packet can be on the network. Each router that processes this packet decrements the TTL value by 1. If the value reaches zero, the packet is discarded from the network. The purpose of this field is to eliminate the possibility of a packet endlessly traversing the network.