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What does GRE stand for in cloud computing?
a. General Routing Enhancement
b. Generic Routing Encapsulation
c. Global Routing Extension
d. Gateway Relay Encapsulation
Answer: b. Generic Routing Encapsulationuninets+1
Which company originally developed GRE?
a. Microsoft
b. Juniper
c. Cisco
d. VMware
Answer: c. Ciscojumpcloud+1
GRE primarily operates at which OSI layer?
a. Physical
b. Data link
c. Network
d. Transport
Answer: c. Networkgeeksforgeeks+1
Which field in the outer IP header of a GRE packet specifies the protocol as GRE?
a. TTL
b. Source Address
c. Protocol Field
d. Options
Answer: c. Protocol Fieldipcisco+1
What number represents GRE in the IP protocol field?
a. 6
b. 17
c. 41
d. 47
Answer: d. 47jumpcloud+1
What is the main purpose of GRE in cloud networking?
a. Encrypting user data
b. Tunneling diverse network layer protocols
c. Bandwidth optimization
d. Quality of Service control
Answer: b. Tunneling diverse network layer protocolsipcisco+1
Which two addresses are present in the delivery header during GRE encapsulation?
a. MAC addresses
b. Original and tunnel destination addresses
c. New source and destination IPs
d. IPv6 only
Answer: c. New source and destination IPsgeeksforgeeks
GRE is considered a __________ protocol.
a. Stateful
b. Stateless
c. Encrypted
d. Secure
Answer: b. Statelessjumpcloud+1
What is the primary drawback of GRE by itself?
a. High cost
b. Complexity
c. No inherent security
d. Single vendor support
Answer: c. No inherent securitydigitaltut+1
For securing GRE tunnels, what protocol is commonly used?
a. FTP
b. IPsec
c. SNMP
d. ARP
Answer: b. IPsecdigitaltut+1
Which statement about GRE tunnels is true?
a. They support only IPv4
b. They only transport encrypted packets
c. They support multiple Layer 3 protocols
d. They are only for private networks
Answer: c. They support multiple Layer 3 protocolsipcisco+1
GRE tunneling creates what type of connection between two endpoints?
a. Mesh link
b. Virtual point-to-point link
c. Ring topology
d. Collision domain
Answer: b. Virtual point-to-point linkjuniper+1
Which header is inserted between two IP headers in GRE tunneling?
a. VLAN header
b. GRE header
c. ARP header
d. Ethernet header
Answer: b. GRE headergeeksforgeeks+1
A GRE header is typically how many bytes long (without options)?
a. 8
b. 4
c. 16
d. 2
Answer: b. 4jumpcloud+1
What is required for GRE tunnel endpoints to communicate?
a. Same physical interface type
b. Direct Ethernet connection
c. IP reachability
d. No route between ends
Answer: c. IP reachabilitycisco+1
What is the recommended MTU size for GRE tunnels to avoid fragmentation?
a. 1500 bytes
b. 1400 bytes
c. 1300 bytes
d. 1200 bytes
Answer: b. 1400 bytespynetlabs
Can multicast traffic be transported using GRE tunnels?
a. Yes
b. No
c. Only with MPLS
d. Only with IPv6
Answer: a. Yesbunny+1
Which type of interface is created for GRE on routers?
a. GigabitEthernet
b. Tunnel
c. VLAN
d. Loopback
Answer: b. Tunnelgeeksforgeeks+1
In which WAN solution is GRE often used for protocol independence?
a. SDN
b. MPLS
c. IPSec VPN
d. All of the above
Answer: d. All of the aboveipcisco+1
What is the main reason to combine GRE with IPSec?
a. Compression
b. Encryption and protocol flexibility
c. Increased speed
d. Better routing
Answer: b. Encryption and protocol flexibilitydigitaltut+1
Which of these would be encapsulated within a GRE tunnel?
a. Only IPv4 packets
b. Only IPv6 packets
c. Multiple network layer protocols
d. Only broadcasts
Answer: c. Multiple network layer protocolspynetlabs+1
Which field in the GRE header indicates the type of encapsulated payload?
a. Checksum
b. Key
c. Protocol Type
d. Version
Answer: c. Protocol Typejumpcloud
Which of the following best describes the role of GRE in hybrid cloud environments?
a. Load balancing
b. Bridging private and public networks
c. Certificate management
d. Monitoring performance
Answer: b. Bridging private and public networkspaloaltonetworks+1
In GRE tunneling, the router at the tunnel exit point is called what?
a. Intermediate node
b. Tunnel endpoint
c. Switch
d. Data originator
Answer: b. Tunnel endpointgeeksforgeeks+1
What must be whitelisted in the firewall for GRE tunnel operation?
a. Source port 22
b. Protocol number 47
c. MAC addresses
d. VLAN IDs
Answer: b. Protocol number 47pynetlabs
Which GRE configuration command specifies the remote tunnel endpoint on Cisco routers?
a. tunnel source
b. ip address
c. tunnel destination
d. tunnel key
Answer: c. tunnel destinationdigitaltut+1
What does the “stateless” nature of GRE imply?
a. It keeps track of all active connections
b. It does not maintain session state information
c. It randomly assigns IPs
d. It is inherently encrypted
Answer: b. It does not maintain session state informationjumpcloud
What is the GRE tunnel interface’s purpose in IP routing tables?
a. To store routing metrics
b. To serve as a route for encapsulated traffic
c. To disable routing updates
d. To assign MAC addresses
Answer: b. To serve as a route for encapsulated trafficipcisco+1
Which scenario commonly uses GRE tunnels?
a. IPv6 packets over IPv4 infrastructure
b. FTP traffic routing
c. DNS over UDP
d. Ethernet over serial
Answer: a. IPv6 packets over IPv4 infrastructurepynetlabs+1
What limitation does GRE have regarding encryption?
a. Supports only WPA2
b. No native encryption
c. Uses built-in AES
d. Works only with certificates
Answer: b. No native encryptiondigitaltut+1
Which protocol is frequently used to protect GRE tunnels in cloud deployments?
a. SNMP
b. DNSSEC
c. IPsec
d. OSPF
Answer: c. IPsecdigitaltut+1
What occurs when the GRE MTU exceeds the path MTU?
a. Improved performance
b. Packet loss or fragmentation
c. Faster tunnels
d. Lower latency
Answer: b. Packet loss or fragmentationpynetlabs
What is required on both GRE tunnel endpoints for successful operation?
a. Matching subnet mask
b. Public IP addresses and reachability
c. Same router model
d. Only one must have configuration
Answer: b. Public IP addresses and reachabilitycisco+1
What is the “payload” in GRE terminology?
a. Tunnel IP
b. Outer IP header
c. Original data packet being transported
d. Encryption protocol
Answer: c. Original data packet being transportedgeeksforgeeks+1
Which GRE header field provides a way to identify different tunnels?
a. Sequence number
b. Key
c. Checksum
d. RR field
Answer: b. Keyjumpcloud
To encapsulate IPv6 over the IPv4 backbone using GRE, which field ensures the packet type is recognized?
a. Protocol Type
b. VLAN Tag
c. MPLS Label
d. GRE Flag
Answer: a. Protocol Typeipcisco+1
Which network device can terminate a GRE tunnel?
a. Router
b. Switch
c. Access Point
d. Printer
Answer: a. Routergeeksforgeeks+1
What happens at the GRE decapsulation point?
a. Packet is encrypted
b. GRE and delivery headers are removed
c. MAC addresses are added
d. Only checksum is verified
Answer: b. GRE and delivery headers are removedgeeksforgeeks+1
Which technology can leverage GRE tunnels for secure cloud connectivity?
a. NAT
b. IPsec VPN
c. FTP
d. DHCP Relay
Answer: b. IPsec VPNdigitaltut+1
What is an important step before enabling GRE through a firewall?
a. Increase timeouts
b. Whitelist GRE protocol number (47)
c. Increase MTU to 1600
d. Disable NAT
Answer: b. Whitelist GRE protocol number (47)pynetlabs
Which statement about GRE tunnel endpoints is correct?
a. Endpoints must be directly connected
b. Endpoints require valid routing to each other
c. Only one endpoint needs configuration
d. Endpoints cannot be firewalls
Answer: b. Endpoints require valid routing to each otherexamtopics+1
In GRE, which component encapsulates the inner payload protocol?
a. Outer IP header
b. GRE header
c. MAC header
d. ARP header
Answer: b. GRE headerjumpcloud+1
If a tunnel source or destination is not reachable, what is the tunnel status?
a. Up
b. Down
c. Partial
d. Standby
Answer: b. Downexamtopics+1
Which design pattern in cloud environments uses GRE to connect remote sites?
a. Hub-and-spoke
b. Bus
c. Token ring
d. Star
Answer: a. Hub-and-spokepaloaltonetworks+1
GRE tunnel interfaces use which addressing scheme?
a. MAC addresses
b. Loopback addresses
c. Separate tunnel IP addresses
d. No addressing
Answer: c. Separate tunnel IP addressesipcisco+1
In GRE, what enables support for dynamic routing protocols across the tunnel?
a. Encapsulation flexibility
b. Protocol security
c. Data compression
d. Single protocol restriction
Answer: a. Encapsulation flexibilitydigitaltut+1
What will happen if a GRE tunnel is configured with mismatched tunnel keys at each endpoint?
a. Tunnel remains up
b. Tunnel will not form
c. Data will be encrypted
d. Headers will be ignored
Answer: b. Tunnel will not formjumpcloud
What is a common troubleshooting step for GRE tunnels not passing traffic?
a. Change MAC address
b. Check tunnel source/destination IPs and routes
c. Lower the MTU further
d. Enable VLAN tagging
Answer: b. Check tunnel source/destination IPs and routescisco+1
Which summary best describes GRE?
a. Protocol for security
b. Tunneling protocol supporting multiple protocols
c. Application transport protocol
d. Compression method
Answer: b. Tunneling protocol supporting multiple protocolsipcisco+1
What is one practical use of GRE in a multi-cloud scenario?
a. DNS resolution
b. Encryption for file shares
c. Transport of routing updates between clouds
d. Port forwarding
Answer: c. Transport of routing updates between cloudspaloaltonetworks+1

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