Ch. 3 - How Data is Transported Over Networks
What netstat command option lists only current connections, including IP addresses and port numbers? 1. -s 2. -r 3. -n 4. -o
-n
By default, the pathping command sends how many pings per hop? 1. 50 2. 100 3. 200 4. 500
100
Which of the following is not a task handled by a router? 1. A router forwards broadcasts over the network. 2. A router can reroute traffic if the path of first choice is down but a second path is available. 3. A router can interpret Layer 3 and often Layer 4 addressing. 4. A router can connect dissimilar networks.
A router forwards broadcasts over the network.
Which network routing protocol is a path vector protocol that sends updates between routers using TCP? 1. IS-IS 2. OSPF 3. RIP 4. BGP
BGP
What field in an IPv4 packet informs routers the level of precedence they should apply when processing an incoming packet? 1. Differentiated Services (DiffServ) 2. Internet header length (IHL) 3. Time to Live (TTL) 4. Padding
Differentiated Services (DiffServ)
As a network support technician, you only need to know how to support IPv6. T/F
False
UDP provides error checking, but not sequencing. T/F
False
What two fields below are used by IPv4 and IPv6 respectively to limit the number of times that a packet can be forwarded on a network? 1. hop limit 2. TTL 3. max path count 4. total time routing
Hop Limit and TTL
What protocol replaces ARP, IGMP, and ICMPv4 on IPv6 based networks? 1. ARPng 2. BGPv6 3. IGMPv6 4. ICMPv6
ICMPv6
What IPv4 protocol handles multicasting for tasks such as videoconferencing or teleconferencing? 1. ICMP 2. ARP 3. TCP 4. IGMP
IGMP
What versions of the IP protocol are used on networks today? 1. IPv1 2. IPv4 3. IPv6 4. IPv5
IPv4 and IPv6
At what layer of the OSI model would a TCP or UDP header be added to a payload? 1. Layer 7 2. Layer 4 3. Layer 2 4. Layer 1
Layer 4
What command can be used on a Cisco router to view the routing table? 1. route print 2. netstat -r 3. route 4. show ip route
show ip route
In a TCP segment, what field indicates how many bytes the sender can issue to a receiver while acknowledgement for the segment is outstanding? 1. urgent pointer 2. sliding window 3. sequence number 4. URG flag
sliding window
Which of the following are types of entries an ARP table contains? 1. Static 2. Flat 3. Basic 4. Dynamic
static and dynamic
What happens when a router receives a packet with a TTL of 0? 1. The router attempts to forward the traffic on a local network 2. The router drops the packet and sends an ICMP TTL expired message back to the host. 3. The router resets the TTL to 128. 4. The router marks the packet as corrupted and forwards it to the next hop.
The router drops the packet and sends an ICMP TTL expired message back to the host.
On IPv4 networks, IGMP operates at the Network layer of the OSI model to manage multicasting. T/F
True
When viewing the routing table on a UNIX system, what flag indicates if a route is a usable route? 1. I 2. H 3. G 4. U
U
What TCP field below allows the receiving node to determine whether a TCP segment is corrupted during transmission? 1. checksum 2. sliding window 3. acknowledgement number 4. TCP header length
checksum
What type of routing protocol enables routers to communicate beyond neighboring routers, allowing each router to create a map of an entire network? 1. distance vector 2. link state 3. exterior gateway 4. map extension
link state
