diff --git a/src/main/kotlin/drills/drill09/average/AverageNode.kt b/src/main/kotlin/drills/drill09/average/AverageNode.kt
index 80d4bbc..a1dc3dc 100644
--- a/src/main/kotlin/drills/drill09/average/AverageNode.kt
+++ b/src/main/kotlin/drills/drill09/average/AverageNode.kt
@@ -1,8 +1,8 @@
 package drills.drill09.average
 
 import util.network.epidemic.EpidemicNode
-import util.network.epidemic.EpidemicPacket
-import util.network.epidemic.replay.ReplayPacket
+import util.network.epidemic.packet.EpidemicPacket
+import util.network.epidemic.packet.FeedbackEpidemicPacket
 import util.network.simulator.Address
 import util.network.simulator.Network
 
@@ -10,12 +10,15 @@ class AverageNode(
     address: Address,
     network: Network,
     initialValue: Double,
+    val infectStrategy: InfectStrategy = InfectStrategy.PUSH,
     bufferSize: Int = 1
-) : EpidemicNode<Double, ReplayPacket<Double>>(address, network, initialValue, bufferSize) {
-    override fun receivePushOrReply(packet: ReplayPacket<Double>) {
+) : EpidemicNode<Double, FeedbackEpidemicPacket<Double>>(
+    address, network, initialValue, bufferSize
+) {
+    override fun receivePushOrReply(packet: FeedbackEpidemicPacket<Double>) {
         val payload = packet.payload
 
-        if (packet.isReplay)
+        if (packet.isFeedback)
             changeValue(payload)
         else {
             val newValue = (nodeValue + payload) / 2
@@ -23,21 +26,34 @@ class AverageNode(
             changeValue(newValue)
 
             send(
-                ReplayPacket(
+                FeedbackEpidemicPacket(
                     address,
                     packet.senderAddress,
                     newValue,
-                    EpidemicPacket.Type.PUSH,
+                    if (infectStrategy == InfectStrategy.PUSH)
+                        EpidemicPacket.Type.PUSH else EpidemicPacket.Type.REPLY,
                     true
                 )
             )
 
-            sendPush()
+            when (infectStrategy) {
+                InfectStrategy.PUSH -> sendPush()
+                InfectStrategy.PULL -> sendPull()
+                InfectStrategy.PUSHPULL -> sendPushPull()
+            }
         }
     }
 
-    override fun receivePull(packet: ReplayPacket<Double>) {
-        TODO("Not yet implemented")
+    override fun receivePull(packet: FeedbackEpidemicPacket<Double>) {
+        if (packet.type == EpidemicPacket.Type.PUSHPULL)
+            return
+
+        send(
+            makeInfectionPacket(
+                packet.senderAddress,
+                EpidemicPacket.Type.REPLY
+            )
+        )
     }
 
     override fun infect() {
@@ -48,7 +64,7 @@ class AverageNode(
         receiverAddress: Address,
         type: EpidemicPacket.Type
     ): EpidemicPacket<Double> {
-        return ReplayPacket(
+        return FeedbackEpidemicPacket(
             address,
             receiverAddress,
             nodeValue,
@@ -56,4 +72,27 @@ class AverageNode(
             false
         )
     }
+
+    companion object {
+        fun createPushNode(
+            address: Address,
+            network: Network,
+            initialValue: Double,
+            bufferSize: Int = 1
+        ) = AverageNode(address, network, initialValue, InfectStrategy.PUSH, bufferSize)
+
+        fun createPullNode(
+            address: Address,
+            network: Network,
+            initialValue: Double,
+            bufferSize: Int = 1
+        ) = AverageNode(address, network, initialValue, InfectStrategy.PULL, bufferSize)
+
+        fun createPushPullNode(
+            address: Address,
+            network: Network,
+            initialValue: Double,
+            bufferSize: Int = 1
+        ) = AverageNode(address, network, initialValue, InfectStrategy.PUSHPULL, bufferSize)
+    }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/drills/drill09/average/TestPull.kt b/src/main/kotlin/drills/drill09/average/TestPull.kt
new file mode 100644
index 0000000..7fed07d
--- /dev/null
+++ b/src/main/kotlin/drills/drill09/average/TestPull.kt
@@ -0,0 +1,35 @@
+package drills.drill09.average
+
+import util.network.epidemic.packet.EpidemicPacket
+import util.network.epidemic.packet.FeedbackEpidemicPacket
+import util.network.simulator.Address
+import util.network.simulator.Network
+
+fun main() {
+    val network = Network()
+
+    repeat(17) {
+        AverageNode.createPullNode(Address(it), network, 0.0)
+    }
+
+    val alpha = network.getRandomNode() as AverageNode
+    val beta = network.getRandomNode() as AverageNode
+
+    val packet = FeedbackEpidemicPacket(
+        alpha.address,
+        beta.address,
+        1,
+        EpidemicPacket.Type.REPLY,
+        false
+    )
+
+    alpha.send(packet)
+
+    network.start()
+
+    Thread.sleep(2000)
+
+    network.forEach {
+        println(1.0 / (it as AverageNode).nodeValue)
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/drills/drill09/average/Test.kt b/src/main/kotlin/drills/drill09/average/TestPush.kt
similarity index 71%
rename from src/main/kotlin/drills/drill09/average/Test.kt
rename to src/main/kotlin/drills/drill09/average/TestPush.kt
index ae5aef9..a196d3f 100644
--- a/src/main/kotlin/drills/drill09/average/Test.kt
+++ b/src/main/kotlin/drills/drill09/average/TestPush.kt
@@ -1,7 +1,7 @@
 package drills.drill09.average
 
-import util.network.epidemic.EpidemicPacket
-import util.network.epidemic.replay.ReplayPacket
+import util.network.epidemic.packet.EpidemicPacket
+import util.network.epidemic.packet.FeedbackEpidemicPacket
 import util.network.simulator.Address
 import util.network.simulator.Network
 
@@ -9,13 +9,13 @@ fun main() {
     val network = Network()
 
     repeat(17) {
-        AverageNode(Address(it), network, 0.0)
+        AverageNode.createPushNode(Address(it), network, 0.0)
     }
 
     val alpha = network.getRandomNode() as AverageNode
     val beta = network.getRandomNode() as AverageNode
 
-    val packet = ReplayPacket(
+    val packet = FeedbackEpidemicPacket(
         alpha.address,
         beta.address,
         1,
diff --git a/src/main/kotlin/drills/drill09/average/TestPushPull.kt b/src/main/kotlin/drills/drill09/average/TestPushPull.kt
new file mode 100644
index 0000000..b34c7c1
--- /dev/null
+++ b/src/main/kotlin/drills/drill09/average/TestPushPull.kt
@@ -0,0 +1,35 @@
+package drills.drill09.average
+
+import util.network.epidemic.packet.EpidemicPacket
+import util.network.epidemic.packet.FeedbackEpidemicPacket
+import util.network.simulator.Address
+import util.network.simulator.Network
+
+fun main() {
+    val network = Network()
+
+    repeat(17) {
+        AverageNode.createPushPullNode(Address(it), network, 0.0)
+    }
+
+    val alpha = network.getRandomNode() as AverageNode
+    val beta = network.getRandomNode() as AverageNode
+
+    val packet = FeedbackEpidemicPacket(
+        alpha.address,
+        beta.address,
+        1,
+        EpidemicPacket.Type.REPLY,
+        false
+    )
+
+    alpha.send(packet)
+
+    network.start()
+
+    Thread.sleep(2000)
+
+    network.forEach {
+        println(1.0 / (it as AverageNode).nodeValue)
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/drills/drill09/dbreplica/DbNode.kt b/src/main/kotlin/drills/drill09/dbreplica/DbNode.kt
index 9e3b300..757b9a3 100644
--- a/src/main/kotlin/drills/drill09/dbreplica/DbNode.kt
+++ b/src/main/kotlin/drills/drill09/dbreplica/DbNode.kt
@@ -1,54 +1,84 @@
 package drills.drill09.dbreplica
 
-import util.network.epidemic.TimePayload
+import util.network.epidemic.TimedPayload
 import util.network.epidemic.EpidemicNode
-import util.network.epidemic.EpidemicPacket
+import util.network.epidemic.packet.EpidemicPacket
+import util.network.epidemic.packet.TimedEpidemicPacket
 import util.network.simulator.Address
 import util.network.simulator.Network
 
 class DbNode<T>(
     address: Address,
     network: Network,
-    initialValue: TimePayload<T>,
+    initialValue: TimedPayload<T>,
+    val infectStrategy: InfectStrategy = InfectStrategy.PUSHPULL,
     bufferSize: Int = 1
-) : EpidemicNode<TimePayload<T>, EpidemicPacket<TimePayload<T>>>(
+) : EpidemicNode<TimedPayload<T>, TimedEpidemicPacket<T>>(
     address, network, initialValue, bufferSize
 ) {
-    override fun receivePushOrReply(packet: EpidemicPacket<TimePayload<T>>) {
+    override fun receivePushOrReply(packet: TimedEpidemicPacket<T>) {
         val receivedValue = packet.payload
 
         if (nodeValue.timestamp < receivedValue.timestamp)
             changeValue(receivedValue)
     }
 
-    override fun receivePull(packet: EpidemicPacket<TimePayload<T>>) {
+    override fun receivePull(packet: TimedEpidemicPacket<T>) {
         val receivedValue = packet.payload
 
         if (nodeValue.timestamp > receivedValue.timestamp)
             send(
-                EpidemicPacket(
-                    address,
+                makeInfectionPacket(
                     packet.senderAddress,
-                    nodeValue,
                     EpidemicPacket.Type.REPLY
                 )
             )
     }
 
     override fun infect() {
-        sendPushPull()
-        Thread.sleep(100)
+        when (infectStrategy) {
+            InfectStrategy.PUSH -> sendPush()
+            InfectStrategy.PULL -> sendPull()
+            InfectStrategy.PUSHPULL -> sendPushPull()
+        }
+
+        Thread.sleep(DELTA)
     }
 
     override fun makeInfectionPacket(
         receiverAddress: Address,
         type: EpidemicPacket.Type
-    ): EpidemicPacket<TimePayload<T>> {
-        return EpidemicPacket(
+    ): EpidemicPacket<TimedPayload<T>> {
+        return TimedEpidemicPacket(
             address,
             receiverAddress,
             nodeValue,
             type
         )
     }
+
+    companion object {
+        const val DELTA = 100L
+
+        fun <T> createPushNode(
+            address: Address,
+            network: Network,
+            initialValue: TimedPayload<T>,
+            bufferSize: Int = 1
+        ) = DbNode(address, network, initialValue, InfectStrategy.PUSH, bufferSize)
+
+        fun <T> createPullNode(
+            address: Address,
+            network: Network,
+            initialValue: TimedPayload<T>,
+            bufferSize: Int = 1
+        ) = DbNode(address, network, initialValue, InfectStrategy.PULL, bufferSize)
+
+        fun <T> createPushPullNode(
+            address: Address,
+            network: Network,
+            initialValue: TimedPayload<T>,
+            bufferSize: Int = 1
+        ) = DbNode(address, network, initialValue, InfectStrategy.PUSHPULL, bufferSize)
+    }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/drills/drill09/dbreplica/Test.kt b/src/main/kotlin/drills/drill09/dbreplica/TestPull.kt
similarity index 72%
rename from src/main/kotlin/drills/drill09/dbreplica/Test.kt
rename to src/main/kotlin/drills/drill09/dbreplica/TestPull.kt
index 0c80018..b840212 100644
--- a/src/main/kotlin/drills/drill09/dbreplica/Test.kt
+++ b/src/main/kotlin/drills/drill09/dbreplica/TestPull.kt
@@ -1,6 +1,6 @@
 package drills.drill09.dbreplica
 
-import util.network.epidemic.TimePayload
+import util.network.epidemic.TimedPayload
 import util.network.simulator.Address
 import util.network.simulator.Network
 
@@ -9,7 +9,7 @@ fun main() {
     val network = Network()
 
     repeat(10) {
-        DbNode(Address(it), network, TimePayload(0, 0))
+        DbNode.createPullNode(Address(it), network, TimedPayload(0, 0))
     }
 
     val alpha = network.getRandomNode() as DbNode<Int>
@@ -22,7 +22,7 @@ fun main() {
         println((it as DbNode<Int>).nodeValue)
     }
 
-    alpha.changeValue(TimePayload(42, System.nanoTime()))
+    alpha.changeValue(TimedPayload(42, System.nanoTime()))
     Thread.sleep(2000)
 
     network.forEach {
diff --git a/src/main/kotlin/drills/drill09/dbreplica/TestPush.kt b/src/main/kotlin/drills/drill09/dbreplica/TestPush.kt
new file mode 100644
index 0000000..e396619
--- /dev/null
+++ b/src/main/kotlin/drills/drill09/dbreplica/TestPush.kt
@@ -0,0 +1,32 @@
+package drills.drill09.dbreplica
+
+import util.network.epidemic.TimedPayload
+import util.network.simulator.Address
+import util.network.simulator.Network
+
+
+fun main() {
+    val network = Network()
+
+    repeat(10) {
+        DbNode.createPushNode(Address(it), network, TimedPayload(0, 0))
+    }
+
+    val alpha = network.getRandomNode() as DbNode<Int>
+
+    network.start()
+
+    Thread.sleep(1000)
+
+    network.forEach {
+        println((it as DbNode<Int>).nodeValue)
+    }
+
+    alpha.changeValue(TimedPayload(42, System.nanoTime()))
+    Thread.sleep(2000)
+
+    network.forEach {
+        println((it as DbNode<Int>).nodeValue)
+    }
+}
+
diff --git a/src/main/kotlin/drills/drill09/dbreplica/TestPushPull.kt b/src/main/kotlin/drills/drill09/dbreplica/TestPushPull.kt
new file mode 100644
index 0000000..15a4c0d
--- /dev/null
+++ b/src/main/kotlin/drills/drill09/dbreplica/TestPushPull.kt
@@ -0,0 +1,32 @@
+package drills.drill09.dbreplica
+
+import util.network.epidemic.TimedPayload
+import util.network.simulator.Address
+import util.network.simulator.Network
+
+
+fun main() {
+    val network = Network()
+
+    repeat(10) {
+        DbNode.createPushPullNode(Address(it), network, TimedPayload(0, 0))
+    }
+
+    val alpha = network.getRandomNode() as DbNode<Int>
+
+    network.start()
+
+    Thread.sleep(1000)
+
+    network.forEach {
+        println((it as DbNode<Int>).nodeValue)
+    }
+
+    alpha.changeValue(TimedPayload(42, System.nanoTime()))
+    Thread.sleep(2000)
+
+    network.forEach {
+        println((it as DbNode<Int>).nodeValue)
+    }
+}
+
diff --git a/src/main/kotlin/util/network/epidemic/EpidemicNode.kt b/src/main/kotlin/util/network/epidemic/EpidemicNode.kt
index 5c2d0c6..a45aa35 100644
--- a/src/main/kotlin/util/network/epidemic/EpidemicNode.kt
+++ b/src/main/kotlin/util/network/epidemic/EpidemicNode.kt
@@ -1,5 +1,6 @@
 package util.network.epidemic
 
+import util.network.epidemic.packet.EpidemicPacket
 import util.network.simulator.Address
 import util.network.simulator.Network
 import util.network.simulator.Node
@@ -75,6 +76,10 @@ abstract class EpidemicNode<T, P: EpidemicPacket<T>>(
         SUSCETIBLE, INFECTED, REMOVED
     }
 
+    enum class InfectStrategy {
+        PUSH, PULL, PUSHPULL
+    }
+
     protected inner class EpidemicReceiver(
         threadGroup: ThreadGroup
     ) : Node.Receiver(threadGroup) {
diff --git a/src/main/kotlin/util/network/epidemic/EpidemicPacket.kt b/src/main/kotlin/util/network/epidemic/EpidemicPacket.kt
deleted file mode 100644
index 469f2b5..0000000
--- a/src/main/kotlin/util/network/epidemic/EpidemicPacket.kt
+++ /dev/null
@@ -1,18 +0,0 @@
-package util.network.epidemic
-
-import util.network.simulator.Address
-import util.network.simulator.packet.PayloadPacket
-
-open class EpidemicPacket<T>(
-    override val senderAddress: Address,
-    override val receiverAddress: Address,
-    override val payload: T,
-    val type: Type
-) : PayloadPacket<T> {
-
-    enum class Type {
-        PUSH, PULL, PUSHPULL, REPLY
-    }
-
-}
-
diff --git a/src/main/kotlin/util/network/epidemic/ReplayPayload.kt b/src/main/kotlin/util/network/epidemic/ReplayPayload.kt
deleted file mode 100644
index d4532f1..0000000
--- a/src/main/kotlin/util/network/epidemic/ReplayPayload.kt
+++ /dev/null
@@ -1,6 +0,0 @@
-package util.network.epidemic
-
-data class ReplayPayload<T>(
-    val value: T,
-    val isReplay: Boolean = true
-)
\ No newline at end of file
diff --git a/src/main/kotlin/util/network/epidemic/TimePayload.kt b/src/main/kotlin/util/network/epidemic/TimePayload.kt
deleted file mode 100644
index 209ff21..0000000
--- a/src/main/kotlin/util/network/epidemic/TimePayload.kt
+++ /dev/null
@@ -1,9 +0,0 @@
-package util.network.epidemic
-
-data class TimePayload<T>(val value: T, val timestamp: Long) {
-    companion object {
-        fun <T> createContent(value: T): TimePayload<T> {
-            return TimePayload(value, System.nanoTime())
-        }
-    }
-}
\ No newline at end of file
diff --git a/src/main/kotlin/util/network/epidemic/TimedPayload.kt b/src/main/kotlin/util/network/epidemic/TimedPayload.kt
new file mode 100644
index 0000000..9177dd0
--- /dev/null
+++ b/src/main/kotlin/util/network/epidemic/TimedPayload.kt
@@ -0,0 +1,9 @@
+package util.network.epidemic
+
+data class TimedPayload<T>(val value: T, val timestamp: Long) {
+    companion object {
+        fun <T> createContent(value: T): TimedPayload<T> {
+            return TimedPayload(value, System.nanoTime())
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/util/network/epidemic/packet/EpidemicPacket.kt b/src/main/kotlin/util/network/epidemic/packet/EpidemicPacket.kt
new file mode 100644
index 0000000..ee11230
--- /dev/null
+++ b/src/main/kotlin/util/network/epidemic/packet/EpidemicPacket.kt
@@ -0,0 +1,13 @@
+package util.network.epidemic.packet
+
+import util.network.simulator.packet.PayloadPacket
+
+interface EpidemicPacket<T>: PayloadPacket<T> {
+    val type: Type
+
+    enum class Type {
+        PUSH, PULL, PUSHPULL, REPLY
+    }
+
+}
+
diff --git a/src/main/kotlin/util/network/epidemic/packet/FeedbackEpidemicPacket.kt b/src/main/kotlin/util/network/epidemic/packet/FeedbackEpidemicPacket.kt
new file mode 100644
index 0000000..f0ac662
--- /dev/null
+++ b/src/main/kotlin/util/network/epidemic/packet/FeedbackEpidemicPacket.kt
@@ -0,0 +1,13 @@
+package util.network.epidemic.packet
+
+import util.network.simulator.Address
+import util.network.simulator.packet.FeedbackPacket
+
+data class FeedbackEpidemicPacket<T>(
+    override val senderAddress: Address,
+    override val receiverAddress: Address,
+    override val payload: T,
+    override val type: EpidemicPacket.Type,
+    override val isFeedback: Boolean
+) : EpidemicPacket<T>, FeedbackPacket
+
diff --git a/src/main/kotlin/util/network/epidemic/packet/TimedEpidemicPacket.kt b/src/main/kotlin/util/network/epidemic/packet/TimedEpidemicPacket.kt
new file mode 100644
index 0000000..c8942f1
--- /dev/null
+++ b/src/main/kotlin/util/network/epidemic/packet/TimedEpidemicPacket.kt
@@ -0,0 +1,11 @@
+package util.network.epidemic.packet
+
+import util.network.epidemic.TimedPayload
+import util.network.simulator.Address
+
+data class TimedEpidemicPacket<T>(
+    override val senderAddress: Address,
+    override val receiverAddress: Address,
+    override val payload: TimedPayload<T>,
+    override val type: EpidemicPacket.Type
+): EpidemicPacket<TimedPayload<T>>
\ No newline at end of file
diff --git a/src/main/kotlin/util/network/epidemic/replay/ReplayPacket.kt b/src/main/kotlin/util/network/epidemic/replay/ReplayPacket.kt
deleted file mode 100644
index b3eb725..0000000
--- a/src/main/kotlin/util/network/epidemic/replay/ReplayPacket.kt
+++ /dev/null
@@ -1,13 +0,0 @@
-package util.network.epidemic.replay
-
-import util.network.epidemic.EpidemicPacket
-import util.network.simulator.Address
-
-class ReplayPacket<T>(
-    senderAddress: Address,
-    receiverAddress: Address,
-    payload: T,
-    type: Type,
-    val isReplay: Boolean
-) : EpidemicPacket<T>(senderAddress, receiverAddress, payload, type)
-
diff --git a/src/main/kotlin/util/network/simulator/packet/FeedbackPacket.kt b/src/main/kotlin/util/network/simulator/packet/FeedbackPacket.kt
new file mode 100644
index 0000000..21be67a
--- /dev/null
+++ b/src/main/kotlin/util/network/simulator/packet/FeedbackPacket.kt
@@ -0,0 +1,5 @@
+package util.network.simulator.packet
+
+interface FeedbackPacket: Packet {
+    val isFeedback: Boolean
+}
\ No newline at end of file