54 questions
UDP provides error checking, but not sequencing.
True
False
IP is an unreliable, connectionless protocol, as it does not establish a session to send its packets.
True
False
IPv4 and IPv6 use the same packet format.
True
False
TCP uses a four-step process called a four-way handshake to establish a TCP connection.
True
False
The cost of upgrading infrastructure has been a major factor in the slow adoption of IPv6.
True
False
In general, a Layer 3 or Layer 4 switch is still optimized for fast Layer 2 data handling.
True
False
Routing Information Protocol (RIP) is an interior gateway protocol that uses a link-state algorithm.
True
False
The Border Gateway Protocol is considered to be a hybrid routing protocol.
True
False
The pathping utility sends 10 pings per hop by default.
True
False
The CTRL + S key combination can be used to stop an actively running command.
True
False
What is NOT one of the three characteristics of TCP in its role as a reliable delivery protocol?
Connection-oriented Protocol
Sequencing and checksums
Framing
Flow Control
What field in an IPv4 packet informs routers the level of precedence they should apply when processing an incoming packet?
Differentiated Services (DiffServ)
Internet header length (IHL)
Time to Live (TTL)
Padding
What command will list only current connections, including IP addresses and port numbers?
show ip stats
netstat -n
netstat -s
portstat
What utility is the equivalent to the pathping command on a Linux system?
mtr
tracepath
traceroute
hping
Which statement regarding the Border Gateway Protocol (BGP) is accurate?
BGP is limited to a single autonomous system.
BGP is exclusively a distance-vector protocol.
BGP utilizes TCP for communicating updates.
BGP is a more advanced version of OSPF.
In a TCP segment, what field indicates how many bytes the sender can issue to a receiver before acknowledgment is received?
urgent pointer
sliding-window
URG flag
PSH flag
Which of the following is not a task handled by a router?
A router forwards broadcasts over the network.
A router can reroute traffic if the path of first choice is down but a second path is available.
A router can interpret Layer 3 and often Layer 4 addressing.
A router can connect dissimilar networks.
The IP connectionless protocol relies on what other protocol to guarantee delivery of data?
UDP
ICMP
TCP
ARP
You are connected to your network's Cisco router, and need to verify the route table. What command should you enter?
route print
show ip route
route -a
show route-table
Which traceroute command will perform a trace using ICMP echo requests instead of UDP datagrams to the host srv1.mycompany.com?
traceroute -i srv1.mycompany.com
traceroute -w srv1.mycompany.com
traceroute -o ICMP srv1.mycompany.com
traceroute -I srv1.mycompany.com
What is the purpose of the checksum TCP field?
It specifies special options, such as the maximum segment size a network can handle.
It allows the receiving node to determine whether the TCP segment became corrupted during transmission.
It identifies the data segment's position in the stream of data segments being sent.
It confirms receipt of data via a return message to the sender.
What happens when a router receives a packet with a TTL of 0?
The router drops the packet and sends an ICMP TTL expired message back to the host.
The router attempts to forward the traffic on a local network.
The router resets the TTL to 128.
The router marks the packet as corrupted and forwards it to the next hop.
In IPv6, what field is used to indicate what sequence of packets from one source to one or multiple destinations a packet belongs to?
traffic class
group ID
flow label
traffic exchange
What is routing protocol convergence time defined as?
It is the time it takes for the protocol to recognize the best path in the event of a network change.
It is the time it takes for the protocol to recognize that a change has occurred.
It is the amount of time it takes after initial configuration of the protocol for all routes to become known.
It is the amount of time involved in configuration of the routing protocol.
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?
interior gateway protocols
border gateway protocols
distance vector protocols
link-state protocols
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?
IS-IS
BGP
OSPF
EIGRP
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?
EIGRP will increase CPU utilization on core routers.
Increased traffic will result from the switch to EIGRP.
EIGRP may not be available on non-Cisco routers.
Convergence time will be increased with EIGRP.
What tcpdump command can be used to filter out all traffic except SSH traffic?
tcpdump port 22
tcpdump -p 22
tcpdump only ssh
tcpdump -f +ssh
Which command will produce statistics about each message transmitted by a host, separated according to protocol type?
ipconfig -s
netstat -s
ipstat -a
netstat -an
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?
8
15
20
32
What occurs when a collision happens on a network?
The collision goes undetected, and data transmission continues.
The collision will create an error in the network switch, but otherwise, no issues will occur as a result.
Each node on the network stops transmitting, until manually told to reconnect and transmit.
Each node on the network waits a random amount of time and then resends the transmission.
You have been tasked with maintaining a network that is jumbo frame enabled. What does this mean?
The MTU for the network can be as high as 9198 bytes.
The network is not based on the Ethernet standard.
Fragmented frames will be consolidated into whole frames before being sent.
The MTU for the network is set at 65,535 bytes.
What IPv6 field is similar to the TTL field in IPv4 packets?
flow label
next header
hop limit
distance vector
If the VLAN tag is present in an Ethernet frame, what is the maximum frame size?
1492 bytes
1500 bytes
1518 bytes
1522 bytes
By default, what is the MTU size on a typical Ethernet network?
1492 bytes
1500 bytes
1518 bytes
1522 bytes
What routing metric affects a path's potential performance due to delay?
theoretical bandwidth
MTU
latency
load
Which statement does NOT accurately describe characteristics of the OSPF protocol?
OSPF maintains a database of other routers' links.
OSPF has no hop limits on a transmission path.
OSPF provides low network overhead.
OSPF requires very little CPU or memory resources.
Originally codified by ISO, what does the "intermediate system" in IS-IS (Intermediate System to Intermediate System) stand for?
The autonomous systems used by an organization.
An entire network consisting of various network devices.
The administrative boundaries of an organization.
An IS-IS capable network router.
What statement regarding the differences between the Windows tracert utility and the Linux/UNIX/macOS traceroute utility is accurate?
Only tracert can send UDP messages for tracing a path.
By default, the tracert utility uses ICMP echo requests, while traceroute uses UDP datagrams or TCP SYN messages.
The Windows tracert utility does not place limits on the TTL of repeated trial messages.
The tracert utility expects an ICMP port unreachable error message as the final reply to a trace.
In the event of a duplicate MAC address shared by two hosts on a switched network, what statement is accurate?
The hosts that share the same MAC addresses will be completely unable to communicate with any other devices.
The hosts will generate new MAC addresses until the conflict is resolved.
The hosts will still send and receive traffic, but traffic may not always reach the correct destination.
The network switch will eventually crash due to being unable to properly forward traffic.
Which protocol’s header would a Layer 4 device read and process?
ARP
HTTP
IP
TCP
What field in a TCP segment is used to determine if an arriving data unit exactly matches the data unit sent by the source?
Source port
Checksum
DiffServ
Acknowledgement number
At which OSI layer does IP operate?
Application layer
Data Link layer
Network layer
Transport layer
Which OSI layer is responsible for directing data from one LAN to another?
Transport layer
Physical layer
Data Link layer
Network layer
What kind of route is created when a network administrator configures a router to use a specific path between nodes?
Trace route
Best path
Static route
Default route
When a router can’t determine a path to a message’s destination, where does it send the message?
Default gateway
Gateway of last resort
Administrative distance
Routing table
A routing protocol’s reliability and priority are rated by what measurement?
Routing table
MTU
Latency
AD
Which routing protocol does an exterior router use to collect data to build its routing tables?
RIPv2
IP
OSPF
BGP
What is the Internet standard MTU?
65,535 bytes
1,500 bytes
9,198 bytes
1,522 bytes
Which two protocols manage neighbor discovery processes on IPv4 networks?
IPv4 and IPv6
BGP and OSPF
TCP and UDP
ICMP and ARP
Which TCP characteristics distinguish it from UDP? (may choose more than 1)
Checksum
Connectionless Protocol
Sequencing
flow control
What process is used to establish a TCP connection?
Three-way handshake
Flag
IP Address
Port Number
Which two fields in an Ethernet frame help synchronize device communications but are not counted toward the frame’s size?
Preamble
SFD
URG
FIN
Which protocol is supported by ICMPv6 to facilitate neighbor discovery on an IPv6 network?
OSPF
RIP
EIGRP
NDP