Chapter 4 - Network Protocols And Routing

10 September 2022
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question
What is NOT one of the three characteristics of TCP in its role as a reliable delivery protocol?
answer
Framing
question
What field in an IPv4 packet informs routers the level of precedence they should apply when processing an incoming packet?
answer
Differentiated Services (DiffServ)
question
What command will list only current connections, including IP addresses and port numbers?
answer
netstat -n
question
What utility is the equivalent to the pathping command on a Linux system?
answer
mtr
question
Which statement regarding the Border Gateway Protocol (BGP) is accurate?
answer
BGP utilizes TCP for communicating updates.
question
In a TCP segment, what field indicates how many bytes the sender can issue to a receiver before acknowledgment is received?
answer
sliding-window
question
Which of the following is not a task handled by a router?
answer
A router forwards broadcasts over the network.
question
The IP connectionless protocol relies on what other protocol to guarantee delivery of data?
answer
TCP
question
You are connected to your network's Cisco router, and need to verify the route table. What command should you enter?
answer
show ip route
question
Which traceroute command will perform a trace using ICMP echo requests instead of UDP datagrams to the host srv1.mycompany.com?
answer
traceroute -I srv1.mycompany.com
question
What is the purpose of the checksum TCP field?
answer
It allows the receiving node to determine whether the TCP segment became corrupted during transmission.
question
What happens when a router receives a packet with a TTL of 0?
answer
The router drops the packet and sends an ICMP TTL expired message back to the host.
question
In IPv6, what field is used to indicate what sequence of packets from one source to one or multiple destinations a packet belongs to?
answer
flow label
question
What is routing protocol convergence time defined as?
answer
It is the time it takes for the protocol to recognize the best path in the event of a network change.
question
Routing protocols that enable routers to communicate beyond neighboring routers, allowing each router to independently map the network, are known as which type of protocols?
answer
link-state protocols
question
Which routing protocol started as a Cisco proprietary protocol and combines some of the features of a link-state protocol with that of distance-vector protocols?
answer
EIGRP
question
You have been tasked with the replacement of OSPF with EIGRP throughout your organization, which consists of a mixture of Cisco routers and routers from other vendors. What statement is accurate?
answer
EIGRP may not be available on non-Cisco routers.
question
What tcpdump command can be used to filter out all traffic except SSH traffic?
answer
tcpdump port 22
question
Which command will produce statistics about each message transmitted by a host, separated according to protocol type?
answer
netstat -s
question
When using the Routing Information Protocol (RIP), what is the maximum number of hops a message can take between its source and its destination before the destination is considered unreachable?
answer
15
question
You have been tasked with maintaining a network that is jumbo frame enabled. What does this mean?
answer
The MTU for the network can be as high as 9198 bytes.
question
What occurs when a collision happens on a network?
answer
Each node on the network waits a random amount of time and then resends the transmission.
question
What IPv6 field is similar to the TTL field in IPv4 packets?
answer
hop limit
question
If the VLAN tag is present in an Ethernet frame, what is the maximum frame size?
answer
1522 bytes
question
By default, what is the MTU size on a typical Ethernet network?
answer
1500 bytes
question
What routing metric affects a path's potential performance due to delay?
answer
latency
question
Which statement does NOT accurately describe characteristics of the OSPF protocol?
answer
OSPF requires very little CPU or memory resources
question
Originally codified by ISO, what does the "intermediate system" in IS-IS (Intermediate System to Intermediate System) stand for?
answer
An IS-IS capable network router
question
What statement regarding the differences between the Windows tracert utility and the Linux/UNIX/macOS traceroute utility is accurate?
answer
By default, the tracert utility uses ICMP echo requests, while traceroute uses UDP datagrams or TCP SYN messages.
question
In the event of a duplicate MAC address shared by two hosts on a switched network, what statement is accurate?
answer
The hosts will still send and receive traffic, but traffic may not always reach the correct destination.