9 Apr, 2007
Networking Interview Questions
- Which three of the following are true statements about connection-oriented sessions?
* The segments delivered are acknowledged back to the sender upon their reception
* Any segments not acknowledged the are retransmitted by the receiver
* A manageable data flow is maintained in order to avoid congestion, overloading and loss of any data
* Segments are sequenced back into their proper order upon arrival at their destination
Correct answer: A C D
Connection-oriented services are useful for transmitting data from applications that are intolerant of delays and packet re-sequencing. FTP and Telnet applications are based on connection-oriented services as well as some voice and video programs. Any segment that is not acknowledged by the received is retransmitted by the sender.
- What does a metric of 16 hops represent when using RIP?
* Number of hops to the destination
* Destination unreachable
* Number of routers
* Bandwidth
Correct answer: B
Routing Information Protocol (RIP) is a distance vector routing protocol that used hop count as its metric. The maximum hop count is 15, 16 hops is considered unreachable. RIP updates are broadcast every 30 seconds by default. RIP has an administrative distance of 120.
- You need to come up with a TCP/IP addressing scheme for your company. Which two factors must you consider when you define the subnet mask for the network?
* The location of DHCP servers
* The volume of traffic on each subnet
* The number of subnets on the network
* The location of the default gateway
* The number of host IDs on each subnetCorrect answer: C E
When determining which subnet mask to use, you must determine how many hosts and how many subnets are required.
- What is the difference between TCP and UDP?
* TCP is connection-oriented; UDP uses acknowledgements only
* TCP is connection-oriented; UDP is connectionless
* Both TCP and UDP are connection-oriented, but only TCP uses windowing
* TCP and UDP both have sequencing, but UDP is connectionless
The correct answer(s): B
TCP provides guaranteed connection oriented delivery of packets, UDP does not.
- What does the ‘S’ mean when looking at the routing table?
* Statically connected
* Directly connected
* Dynamically attached
* Shutdown route
Correct answer: A
Statically connected routes are those that an administrator has manually entered into the routing table.
- Why would you use static routing instead of dynamic routing?
* When you want automatic updates of the routing tables
* All the time
* When you have very few routes and want to conserve bandwidth
* When you have a gateway of last resort
Correct answer: C
Static routes are typically used when there are very few routes and you want to conserve bandwidth. Since routing protocols are constantly sending their updates across the wire, it can cause a great deal of congestion.
- On Cisco catalyst 5000 how would you set the second port on the controller in the first slot to full duplex?
* Set port duplex 1/1 full
* Set port duplex 1/2 full
* Set port duplex 0/1 full
* Set port duplex 0/2 full
Correct answer: B
The syntax is: set type duplex slot/port
- What does the acronym ARP stand for?
* Address Resolution Phase
* ARP Resolution Protocol
* Address Resolution Protocol
* Address Recall Protocol
Correct answer: C
The Address Resolution Protocol (ARP) resolved IP addresses to MAC addresses.
- What is the default encapsulation of Netware 3.12?
* Ethernet_II
* 802.5
* 802.2
* 802.3
Correct answer: C
The 802.2 Frame Type is the default frame-type for Netware 3.12.
- Regarding frame relay, which of the following statements are true?
* You must use ANSI encapsulation if connecting to non-Cisco equipment
* You must use IETF encapsulation if connecting to non-Cisco equipment
* You must use Q.933a encapsulation if connecting to non-Cisco equipment
* You must use Cisco encapsulation if connecting to non-Cisco equipment
Correct answer: B
Cisco’s encapsulation for Frame relay is proprietary. To communicate with non-Cisco equipment when using frame-relay encapsulation, the IETF method must be used.
